Gaya APA

Burchfield, B, , , C., Foster, R, J. (1982). Physical geology the structure and processes of the earth (1982). : London : Chales E. Merrill Publishing Co,.

Gaya MLA

Burchfield, B, , , C., Foster, Robert, J. "Physical geology the structure and processes of the earth". 1982 : London : Chales E. Merrill Publishing Co,, 1982. Text.