Asimov, I. (1967). Environments out there. London: Abelard-Schuman.
Čikaški stil citiranjaAsimov, Isaac. Environments Out There. London: Abelard-Schuman, 1967.
MLA način citiranjaAsimov, Isaac. Environments Out There. London: Abelard-Schuman, 1967.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.