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
National Academy of Science, 1974
Buku Teks