Παραπομπή APA

Don Leet,L, & Judson, S. (1969). Physical geology (3rd ed.). Prentice hall.

Παραπομπή Chicago Style

Don Leet,L, και Sheldon Judson. Physical Geology. 3rd ed. New delhi: Prentice hall, 1969.

Παραπομπή MLA

Don Leet,L, και Sheldon Judson. Physical Geology. 3rd ed. Prentice hall, 1969.