Long, Gavin
B.T. Batsford, 1969
Buku Teks SO
Mohanlall, Premilla
Malaysian Timber Council, 2002
Buku Referensi
Wood, Julia T., 1950-
Wadsworth and Cengage Learning, 2013
Buku Teks SO
Higgins, Trumbull
Oxford University Press, 19962
Buku Teks
Gunther, John, 1901-1970
Harper Brothers, 1951
Buku Teks SO