edited by Edgar T. Thompson, Robert E. Park
Duke University Press, 1939
Buku Teks
Jaret, Charles
Harper Collins College Publishers, 1995
Buku Teks
Schaefer, Richard T, author
Pearson Education, 2015
Buku Teks
Yarwood, A.T., author
Methuen, 1982
Buku Teks
Rose, Peter I., foreword
Random House, 1964
Buku Teks