Wheeler, Richard S.
Cornell University, 1970
Buku Teks
Verkaaik, Oskar
VU University Press, 1994
Buku Teks
Binder, Leonard
University of California Press, 1961
Buku Teks SO
Rashiduzzaman, M.
Ideal Library, 1967
Buku Teks
Wheeler, Jesse H.
Henry Holt , 1960
Buku Teks