Gaya APA

Piotrow, G, T, &, P, T. (1978). Six Billion People Demographic Dilemmas And World Politics (Second). New York: McGraw-Hill Book Company.

Gaya MLA

Piotrow, George, Tapinos, &, Phyllis, T.. "Six Billion People Demographic Dilemmas And World Politics". Second New York: McGraw-Hill Book Company, 1978. Text.