edited by Bernard Berelson
Voice of America, 1975
Buku Teks
Browne, G.S., author
F.W. Chesire, 1960
Buku Teks
Russell, Sir E. John
George Allen and Unwin, 1961
Buku Teks
Chen, Kuan I., author
Bookman Associates, 1960
Buku Teks
Carr-Saunders, A.M., author
Frank Cass, 1964
Buku Teks