Thompson, Virginia
Stanford University Press , 1955
Buku Teks
Butwell, Richard
Praeger Publishers, 1969
Buku Teks
Allen, Richard
Oxford University Press, 1970
Buku Teks
Butwell, Richard
Praeger, 1961
Buku Teks
Butwell, Richard
Frederick A. Praeger, 1962
Buku Teks