Pound, Roscoe, author
University of Pitsburgh Press, 1942
Buku Teks
Scheb, John M., author
Wadswortg Cengage Learning, 2014
Buku Teks
Holten, N. Gary, author
McGraw-Hill, 1991
Buku Teks
Robinson, Glen O., author
West Publishing, 1986
Buku Teks
Robinson, Glen O., author
West Publishing, 1974
Buku Teks