Gaya APA

Hargraves, S, J, K, S, D, R, S., Relly, P, O. (1978). Physical geology . New Delhi: Prentice Hall.

Gaya MLA

Hargraves, Sheldon, Judson;, Kenneth, S., Deffeyes;, Robert, S.., Relly, Paddy, O.. "Physical geology". New Delhi: Prentice Hall, 1978. Text.