Eckstein, Otto, author
McGraw-Hill, 1983
Buku Teks
edited by Kathleen E. Hug
Office of International Infrmation Programs US Department of State, [Date of publication not identified]
Buku Teks
editor, Kathleen E. Hug; penerjemah, Sumantri Ar.
Office of International Infrmation Programs US Department of State, [date of publication not identified]
Buku Teks
Sanderson, Allen R., author
McGraw-Hill, 1981
Buku Teks
Artikel Jurnal