1. SnowdenR. (1985).Consumer Choice in Family Planning. Family Planning Association, London
2. MakepieceA.W., WeinsteinG.L. and FriedmanM.H. (1937). The effect of progestin and progesterone on ovulation in the rabbit.Am. J. Physiol.,119, 512–516
3. JunkmannK. and WitzelH. (1958). Chemistry and pharmacology of steroidal hormone esters.Z. Vitamin, Hormon, Fermentforsch.,9, 97–143
4. Population Reports, Series A;W. Rinehart,1975
5. DavisM.E. and WiedG.L. (1957). Long-acting progestational agents.Geburtsh. Frauenh.,17 (10), 916–928