Barrass, Robert, author
Routledge, 1995
Buku Teks
Barrass, Robert
Chapman and Hall, 1995
Buku Teks
Fairbairn, Gavin, author
McGraw-Hill, 2012
Buku Teks
O`Shea, Robert P. (Robert Paul), 1953-, author
Harcourt Brace & Company, 1996
Buku Teks
O`Shea, Robert P. (Robert Paul), 1953-, author
Harcourt Brace Jovanovich, 1993
Buku Teks