edited by Jerome Donald Fellmann [and others]
McGraw-Hill, 2013
Buku Teks
Malinowski, Jon C.
McGraw-Hill, 2012
Buku Teks
Knapp, Brian
Longman House, 1992
Buku Teks
Lebon, J. H. G.
Hutchinson University Library, 1969
Buku Teks
Huntington, Ellsworth
John Wiley & Sons, 1951
Buku Teks