APA (7th ed.) Citation

Lousada, O. (2009). Hidden twins: What adult opposite sex twins have to teach us. Karnac.

Chicago Style (17th ed.) Citation

Lousada, Olivia. Hidden Twins: What Adult Opposite Sex Twins Have to Teach Us. London: Karnac, 2009.

MLA (9th ed.) Citation

Lousada, Olivia. Hidden Twins: What Adult Opposite Sex Twins Have to Teach Us. Karnac, 2009.

Warning: These citations may not always be 100% accurate.