Παραπομπή APA

Bock, B., & Bock, K. (1977). soviet bloc merchant ships. Janes publishing Company.

Παραπομπή Chicago Style

Bock, Bruno, και Klaus Bock. Soviet Bloc Merchant Ships. London: Janes publishing Company, 1977.

Παραπομπή MLA

Bock, Bruno, και Klaus Bock. Soviet Bloc Merchant Ships. Janes publishing Company, 1977.