edited by Egbert De Vries, Jose Medina Echavarria
UNESCO, 1967
Buku Teks
Cole, J.P., author
Butterworth, 1965
Buku Teks
Powelson, John P., author
McGraw-Hill , 1964
Buku Teks
Powelson, John P., author
McGraw-Hill , 1964
Buku Teks
Thurber, Glarence E
Duke University Press, 1973
Buku Teks