Birdsall, Stephen S., author
John Wiley & Sons, 1992
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
Birdsall, Stephen S., author
John Wiley & Sons, 1992
Buku Teks
SPS, 1971
Buku Teks
Departemen Penerangan RI
Pradnya Paramita, 1984
Buku Teks