Cita APA (7a ed.)

Westheide, W. (1990). Polychaetes. Interstitial families: Keys and notes for the identification of the species. Universal Book Services.

Cita Chicago Style (17a ed.)

Westheide, W. Polychaetes. Interstitial Families: Keys and Notes for the Identification of the Species. Oegstgeest: Universal Book Services, 1990.

Cita MLA (9a ed.)

Westheide, W. Polychaetes. Interstitial Families: Keys and Notes for the Identification of the Species. Universal Book Services, 1990.