Gaya APA

Heer, D, M., Grigsby, J, S. (1992). Society and population (3rd ed). Englewood Cliffs, NJ: Prentice Hall.

Gaya MLA

Heer, David, M.., Grigsby, Jill, S.. "Society and population". 3rd ed Englewood Cliffs, NJ: Prentice Hall, 1992. Text.