edited by Ronald P. Grelsamer and Suzanne Loebl
Macmilan , 1996
Buku Referensi
Bond, Cecil J., author
McGraw-Hill, 1993
Buku Referensi
edited by Barry Turner
Macmillan, 1995
Buku Referensi
Hoban, Yvonne
McGraw-Hill, 1988
Buku Teks
Prentice-Hall Editorial Staff
Prentice-Hall, 1990
Buku Referensi