Gaya APA

Wiik, K, A. et al (2013). Relationship Quality in Marital and Cohabiting Unions Across Europe . : Wiley-Blackwell.

Gaya MLA

Wiik, Kenneth, Aarskaug. et al. "Relationship Quality in Marital and Cohabiting Unions Across Europe". : Wiley-Blackwell, 2013. e-journal.