edited by Marcello Truzzi
Prentice-Hall, 1968
Buku Teks
Karp, David A., author
Waveland Press Inc., 2004
Buku Teks
McGraw-Hill , 1958
Buku Teks
Hulsey, Nathan, author
Emerald Publishing Limited, 2020
eBooks
Schrag, Clarence C., author
Harper & Row, 1963
Buku Teks