Spengler, Joseph J. (Joseph John), 1902-1991, author
Prentice-Hall, 1974
Buku Teks
Miro, Carmen A.
Frances Pinter Publ., 1980
Buku Teks
edited by Philip M. Hauser
Prentice-Hall, 1969
Buku Teks
edited by Richard A. Easterlin
University of Chicago Press, 1980
Buku Teks
Tan, Ngoc Chau
Unesco, 1972
Buku Teks