edited by Paul B. Horton and Gerald R. Leslie
Prentice-Hall, 1975
Buku Teks
Westhues, Kenneth, author
McGraw-Hill, 1972
Buku Teks
W. van Hoeve, 1958
Buku Teks
edited by Hans L. Zetterberg
Unesco, 1956
Buku Teks
Tuma, Nancy Brandon, author
Academic Press, 1984
Buku Teks