prepared by Richard R. Johnson; Douglas M. Robinson, revised and updated
ASHRAE Learning Institute, 2004
Buku Teks
Rao, Y.V.C., author
Wiley Eastern, 1993
Buku Teks
Haberman, William L., 1922-, author
Allyn and Bacon, 1980
Buku Teks
Cravalho, Ernest G., author
Pitman, 1981
Buku Teks
Spalding, D.B., author
The English Language, 1982
Buku Teks