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References

1. "Biorhythm chart". https://biorhythm.xyz/?dob=1990-01-29. 
2. These cycles are to be adjusted based on the person's personal day clock which may run from 22 hours to 27 hours although 23-25 is the norm. Two ways you can find your personal day clock is grip test and body temperature every 15 minutes for a few days or easier same time each day for a few months.
3. http://www.skepdic.com/biorhyth.html
4. "The History of Biorhythms". http://www.yourbiorhythms.com. 
5. Hoffmann, Frank W., and William G. Bailey, Mind and Society Fads, 1992.
6. http://www.vintage-technology.info/pages/calculators/k/kosmos1.htm
7. "MyCalcDB : Calculator Casio BIOLATOR aka H-801". http://mycalcdb.free.fr/main.php?l=0&id=326. 
8. Heisel, Andrew (15 September 2015). "Biorhythms: The 1970s Fad That Won a Super Bowl, Killed Clark Gable, and Made America Gaga for Computers | VICE Sports" (in en). VICE Sports. https://sports.vice.com/en_us/article/biorhythms-the-1970s-fad-that-won-a-super-bowl-killed-clark-gable-and-made-america-gaga-for-computers. Retrieved 27 December 2016. 
9. Hines, Terence (1998). "Comprehensive Review of Biorhythm Theory" (PDF (summary)). Psychological Reports 83 (1): 19–64. doi:10.2466/PR0.83.5.19-64. PMID 9775660. Archived from the original on February 12, 2009. https://web.archive.org/web/20090212181753/http://ammonsscientific.com/link.php?N=10326. Retrieved 2008-01-13. 
10. Stefan Ploch (2003). "Metatheoretical problems in phonology with Occam's Razor and non-ad-hoc-ness". in Jonathan Kaye, Stefan Ploch. Living on the edge: 28 papers in honour of Jonathan Kaye. Studies in generative grammar. Walter de Gruyter. pp. 166, 174–176, 186, footnotes 15 and 17 in page 199. ISBN 978-3-11-017619-3. https://books.google.com/books?id=0WT96J7swIwC. "the following quote about the pseudoscientific biorhythm theory [p. 174–175] (...) we can eliminate ad hoc hypotheses (i.e. arbitrariness) that are the hallmark of all pseudosciences (astrology, biorhythm theory, (...) [p. 176] Unfortunately, in the case of the most socially successful [not scientific] theories, just as in the case of astrology and biorhythm "theory", we are dealing with something that resembles quackery closely. [p.186] (...) what matters is that falsifying data is systematically discounted in this pseudotheory. [p. 199]" .
11. Stein, Gordon. (1993). Encyclopedia of Hoaxes. Gale Group. p. 161. ISBN:0-8103-8414-0
12. Persinger, MA; Cooke, WJ; Janes, JT (1978). "No evidence for relationship between biorhythms and industrial accidents". Percept mot Skills 46 (2): 423–6. doi:10.2466/pms.1978.46.2.423. PMID 662540.  https://dx.doi.org/10.2466%2Fpms.1978.46.2.423
13. Dudley, Underwood (1997). Numerology: Or What Pythagoras Wrought. The Mathematical Association of America. https://archive.org/details/numerologyorwhat0000dudl. 
14. Carroll, Robert Todd. "Biorhythms". http://www.skepdic.com/biorhyth.html. 
15. Gardner, M. Science, Good, Bad, and Bogus. 
16. Dudley, Underwood. Numerology, or, What Pythagoras wrought. 
17. Casti, John L.. Paradigms Lost. https://archive.org/details/paradigmslostima00cast. 
18. Biersdorfer, J.D.. "Strange Things Happening? Blame Your Biorhythms". New York Times. 
19. Prytula, Robert E (1980). "Studies on the perceived predictive accuracy of biorhythms". Journal of Applied Psychology 65 (6): 723–727. doi:10.1037/0021-9010.65.6.723. ISSN 0021-9010.  https://dx.doi.org/10.1037%2F0021-9010.65.6.723
20. James, Arthur (1984). "The validity of 'biorhythmic' theory questioned". British Journal of Psychology 75 (2): 197–200. doi:10.1111/j.2044-8295.1984.tb01891.x. ISSN 0007-1269. PMID 6733392.  https://dx.doi.org/10.1111%2Fj.2044-8295.1984.tb01891.x
21. Peveto, Natalia (1980-01-01). "The Relationship of Biorhythms to Academic Performance in Reading.". LSU Historical Dissertations and Theses. https://digitalcommons.lsu.edu/gradschool_disstheses/3577.