Fry, Earl H., author
McGraw-Hill, 1983
Buku Teks
Chandra, Prakash, author
Vikas Publishing House, 1982
Buku Teks
Chandra, Prakash, author
Vikas Publishing House, 1982
Buku Teks
Holsti, Kalevi J., author
Prentice-Hall, 1977
Buku Teks
Folsom, Ralph Haughwout, author
[publisher not identified], [date of publication not identified]
Buku Teks