Παραπομπή APA

Parker, B. R. (1984). Concepts of the cosmos: An introduction to astronomy. Harcourt Brace Jovanovich.

Παραπομπή Chicago Style

Parker, Barry R. Concepts of the Cosmos: An Introduction to Astronomy. San Diego: Harcourt Brace Jovanovich, 1984.

Παραπομπή MLA

Parker, Barry R. Concepts of the Cosmos: An Introduction to Astronomy. Harcourt Brace Jovanovich, 1984.