Gaya APA

407;The Thirtd Planet AN INVITATION TO GEOLOGY;Konrad B.Krauskopf;0-97735-359-X;Freeman. (). : .

Gaya MLA

407;The Thirtd Planet AN INVITATION TO GEOLOGY;Konrad B.Krauskopf;0-97735-359-X;Freeman. . : , . Cooper & Company;1;1974.