Braverman, Harry, author
Mounthly Review Press, 1974
Buku Teks
Rutgers University Press, 2003
Buku Teks
Michael Leccese, author
McGraw-Hill, 2000
Buku Teks
Bremner, G. A., author
Oxford University Press, 2016
eBooks
Iowa State University Press , 1964
Buku Teks