Davies, Jack
West Publishing, 1975
Buku Teks
Scheb, John M.
Thomson Wadworth, 2005
Buku Teks
Lorch, Robert S.
Wayne State University Press, 1969
Buku Teks
Robinson, Glen O.
West Publishing, 1974
Buku Teks
Robinson, Glen O.
West Publishing, 1986
Buku Teks