Collazos, Sharon Phillipps
Westview Press, 1991
Buku Teks
Ministry of Labor, 1953
Buku Teks
Twomey, David P.
South-Western Pub, 1985
Buku Teks
Jansen, Ernst P., author
Kluwer, 1994
Buku Teks
Scalapino, Robert A., author
Institute of East Asian Studies, University of California, 1983
Buku Teks