Heer, D. M. (1992). Society and population. Prentice Hall.
Chicago Style (17th ed.) ZitazioaHeer, David M. Society and Population. Englewood Cliffs, N. J.: Prentice Hall, 1992.
MLA (9th ed.) ZitazioaHeer, David M. Society and Population. Prentice Hall, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.