APA

ORR W. N., ORR E. L., .GEOLOGY OF THE PACIFIC NORTH WEST. MEXICO: MCGRAW-HILL.

Chicago

ORR WILLIAM N, ORR ELIZABETH L, .GEOLOGY OF THE PACIFIC NORTH WEST. MEXICO: MCGRAW-HILL.

Harvard

ORR W. N., ORR E. L., .GEOLOGY OF THE PACIFIC NORTH WEST. MEXICO: MCGRAW-HILL.

MLA

ORR WILLIAM N, ORR ELIZABETH L, .MEXICO: MCGRAW-HILL. .