Gemignani, Michael C.
CBI Publishing , 1981
Buku Teks
edited by Chris Reed
Oxford University Press, 2017
Buku Teks
Davies, Jack
West Publishing, 1975
Buku Teks
Wood, William
Percival Marshall, 1949
Buku Teks
Smucker, Bob
Jossey - Bass Publishers, 1991
Buku Teks