Liu, Shia-Ling, author
Kuang Lu Publishing , 1988
Buku Teks
Artikel Jurnal
Molineu, Harold, author
Westerview Press, 1990
Buku Teks
Molineu, Harold, author
Westview Press, 1990
Buku Teks
Barnett, A. Doak (Arthur Doak), author
Harper & Brathers, 1960
Buku Teks