Wooton, Simon
Crest Publishing, 2002
Buku Teks
Osborn, Alex
Charles Scribner`s Sons, 1952
Buku Teks
Russell, Bertrand, 1872-1970, author
George Allen and Unwin, 1956
Buku Teks
Bury, J. B.
Yajasan Pembangunan, 1951
Buku Teks
edited by Robert J. Sternberg and Peter A. Frensch ; penerjemah, Togi Marolop Pradana Pangaribuan
Lawrence Erlbaum Associates, 1991
Buku Teks