Kinyon, Stanley V.
West Publishing Company, 1971
Buku Teks
Hegland, Kenney
West Pub. Co., 1995
Buku Teks
Hegland, Kenney F., author
Thomson West, 2003
Buku Teks
Thompson, George C., author
Wadsworth, 1965
Buku Teks
Thompson, George C., author
Wassworth, 1969
Buku Teks