Harrison, John Armstrong
University of Florida, 1953
Buku Teks
Burks, Ardath W.
Westview Press, 1982
Buku Teks
Burks, Ardath W.
Boulder Westview Press 1991,
Buku Teks
Kajima, Morinosuko
Charles E.Tutle, 1971
Buku Teks
Gibney, Frank
Charles E. Tuttle, 1985
Buku Teks