Hofmann, Joseph Ehrenfried, author
Littlefield, Adams, 1967
Buku Teks
Kitchen, Martin, author
Blackwell Pub, 2012
Buku Teks
editor, Dennis Poupard; associate editor Mark W. Scott
Gale Research Company, 1984-1989
Buku Referensi
Geiss, Imanuel
Routledge, 1997
Buku Teks
Meade, Teresa A., author
Wiley-Blackwell, 2010
Buku Teks