West Publishing Company, 1996
Buku Teks SO
Rodgers, William H.
West Publishing, 1994
Buku Teks SO
Findley, Roger W.
West Publishing, 1992
Buku Teks
edited by Erica l. Dolgin and Thomas G.P. Guilbert
West Publishing, 1997
Buku Teks SO
Findley, Roger W.
West Publishing, 1996
Buku Teks