Whitehead, Randal, author
Rockport Publishers, 1999
Buku Referensi
Leslie, Russell P.
McGraw-Hill, 1996
Buku Teks
The Chractered Institution of Building Services Engineers, 1991
Buku Teks
Pritchard, David C., author
Longman, 1995
Buku Teks
Pritchard, David C., author
Longman, 1995
Buku Teks