Παραπομπή APA

Mitchell, E. (1975). Porpoise,dolphin and small whale fisheries of the world: Status and problems. International Union for Conservation of Nature and Natural Resources.

Παραπομπή Chicago Style

Mitchell, Edward. Porpoise,dolphin and Small Whale Fisheries of the World: Status and Problems. Switzerland: International Union for Conservation of Nature and Natural Resources, 1975.

Παραπομπή MLA

Mitchell, Edward. Porpoise,dolphin and Small Whale Fisheries of the World: Status and Problems. International Union for Conservation of Nature and Natural Resources, 1975.