Johansen, Leif
North-Holland, 1974
Buku Teks SO
Coale, Ansley J.
Princeton University Press, 1958
Buku Teks SO
Coale, Ansley J.
Princeton University Press, 1961
Buku Teks SO
Coale, Ansley J.
Princeton University PRess, 1972
Buku Teks SO
Muscat, Robert J.
Praeger, 1966
Buku Teks