Moore, Harriet
Princeton University Press, 1945
Buku Teks
London : Pancy Lund Humpries
Majalah, Jurnal, Buletin
Hsu, Shuhsi
Kelly & Walsh, 1938
Buku Teks
Clyde, Paul H. (Paul Hibbert), author
Prentice-Hall, [date of publication not identified]
Buku Teks
Beal, Edwin G., author
Library of Congress, 1950
Buku Teks