1.
From Fiction To Fact
, Educational Department, Tampax Incorporated, Lake Success, New York.
2.
Encyclopedia Americana
, Encyclopedia Americana Corporation, 1980.
3. Miller, Majorie A. and Leavell, Latie C.,
Anatomy and Physiology
; 16th edition, The MacMillan Company, New York, 1972.
4. Norman, Anthony B. and Litwak, Gerald,
Hormones,
Academic Press INC., New York, 1987.
5. Silver, Rae and Feder, Harvey H.
, Hormones and Reproductive Behavior
; W.H. Freeman and Company, San Francisco, 1979.
6. Van Nostrand’s Scientific Encyclopedia, Van Nostrand Reinhold company, 5th edition, New York, 1976.