K.L. Knickerbocker ... [and others]
Harcourt, Brace Jovanovics College Publishers, 1985
Buku Teks
Kaufmann, Magdalena
Springer, 2012
eBooks
Lewis, William Draper
Michie, 1937
Buku Teks
edited by Hasting Donnan
SAGE Publication, 2002
Buku Teks
Hartshorn, Truman Asa
John Wiley & Sons, 1980
Buku Teks