The National Board of Health.Circular letter Dno10868/09/72 concerning guidance in fertility regulation in primary health care under the Primary Health Care Act (Lääkintöhallituksen ohjeirje Dno 10868/09/ 72. Ohjeita kansanterveyslain edellyttämästä raskauden ehkäisyneuvonnasta). Helsinki: Valtion painatuskeskus1972.
2.
Miller MD, Ferris DGMeasurement of subjective phenomena in primary care research: the Visual Analogue Scale. Fam Pract Res J1993; 1: 15 - 24.
3.
Gotteberg HJ , Malterud K., Tveter E.Gynekologisk undersokelse og kjonnpreferanse . Tidsskr Nor Laegeforen1990; 110: 236 - 7.
4.
Sihvo S., Koponen P.From family planning to reproductive health - use of healthcare services and need for their further development. National Research and Development Centre for Welfare and Health, 1998, Report 220:10, Helsinki ISBN 951-33-0540-6.
5.
National Research and Development Centre for Welfare.Abortions: 1996. Helsinki, 1997.