Gaya APA

Konrad, B, K., Beiser, A. (2000). Study Guide Accompanies: The Physical Universe, Ninth Edition (9th Ed.). United States: McGraw-Hill.

Gaya MLA

Konrad, B., Krauskopf,., Beiser, Arthur. "Study Guide Accompanies: The Physical Universe, Ninth Edition". 9th Ed. United States: McGraw-Hill, 2000. Text.