Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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