Gaya APA

Barlow, M, H., Newton, R, G. (1977). Patterns and Processes in Man's Economic Environtment (2). Singapore: McGraw-Hill International Editions.

Gaya MLA

Barlow, M., H.., Newton, R., G.. "Patterns and Processes in Man's Economic Environtment". 2 Singapore: McGraw-Hill International Editions, 1977. Text.