San Diego : Sosiological Abstracts Inc.
Majalah, Jurnal, Buletin
Norwich : Edward Arnold, The educationl, academic and medical publishing
Majalah, Jurnal, Buletin
New York Funk and Wagnalls Company 1955
Buku Referensi
New York Funk and Wagnalls 1958
Buku Referensi
Tubingen : Laupp & Gobel
Majalah, Jurnal, Buletin