Ethridge, Marcus E., author
Wadsworth and Cengage Learning, 2013
Buku Teks
contributors, Frederick C. Barghoorn ... [and others] ; edited by Sigmund Neumann
University of Chicago Press, 1956
Buku Teks
Chilcote, Ronald H., author
Routledge, 2000
eBooks
Tade Matthias Spranger
Springer, 2012
eBooks
Maddi, Salvatore R., author
The Dassey Press, 1968
Buku Teks