Sybil P. Parker, editor in chief
McGraw-Hill, 1984
Buku Referensi
Sybil P. Parker, editor in chief
McGraw-Hill, 1994
Buku Referensi
Williams, David J.
Prentice - Hall , 1971
Buku Teks
editors in chief, Sybil P. Parker, Robert A. Corbitt
McGraw-Hill, 1993
Buku Referensi
Hutchinson, 1959
Buku Referensi