Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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