Norton, Henry K.
Allen & Unwin , [date of publication not identified]
Buku Teks
Li, Chien-Nung
D. Van Nostrand Company, Inc., 1966
Buku Teks
Utley, Freda
The Bobbs-Merrill Company, 1947
Buku Teks
Russel, Bertrand, author
George Allen and Unwin, 1922
Buku Teks
Lin, Qihong.
H. Vetch , 1930
Buku Teks