Thomlinson, Ralph
Dickenson Publishing, 1975
Buku Teks
The Population Reference Bureau, Inc., 1976
Buku Teks
Kpedekpo, G.M.K.
Heinemann, 1982
Buku Teks
Wunsch, Guillaume J.
Plenum Press, 1978
Buku Teks SO
Matius Irsan Kasau
Celebes Media Perkasa, 2018
Buku Teks