Brachet, Michelle, author
Murray Books (Australia, 2012
Buku Referensi
McCormick, Donald, 1911-, author
Facts on File, 1990
Buku Teks
Pyzdek, Thomas, author
McGraw-Hill, 2010
Buku Teks
Pyzdek, Thomas, author
McGraw-Hill, 2003
Buku Referensi
Ranz, John H.
W.H. Anderson Co., 1966
Buku Teks