APA Citation

Freedman, R. A. (2005). Universe: Student. New York: W. H. Freeman and Company.

Trích dẫn kiểu Chicago

Freedman, Roger A. Universe: Student. New York: W. H. Freeman and Company, 2005.

MLA Citation

Freedman, Roger A. Universe: Student. New York: W. H. Freeman and Company, 2005.

Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.