Crocker, Mary E. Coffman, author
Erlangga, 2005
Buku Teks
Kurbegov, Eliane
Mc Graw Hill, 2012
Buku Teks
Yuen, Ren Chao
University of California Press, 1968
Buku Teks
Starr, Chester G.
Alfred A.Knopf, 1961
Buku Teks
Meyer, Alfred G.
Harvard University Press, 1954
Buku Teks