Gaya APA

Beiser, A., Krauskopf, K, B. (2000). Study guide to accompany the physical universe (Ed.9). Mew York: McGraw-Hill.

Gaya MLA

Beiser, Arthur., Krauskopf, Konrad, B.. "Study guide to accompany the physical universe". Ed.9 Mew York: McGraw-Hill, 2000. Text.