edited by Robert E. Ward and Sakamoto Yoshikazu
University of Hawaii Press, 1987
Buku Teks
Martin, Edwin M
American Institute, 1948
Buku Teks
Fearey, Robert A.
Macmillan, 1950
Buku Teks
Ind, Allison
David McKay, 1958
Buku Teks
Cohen,Theodore
Free Press, 1987
Buku Teks