edited by Holly Koelling
American Library association, 2007
eBooks
Starrett, Vincent
Bantam Books, 1955
Koleksi Publik
R.R. Bowker, 1991
Buku Teks
Reader's Digest Association , 1962
Buku Teks
edited by John P. Holdren, Eric Donald Hirsch
Delta Pub., 1996
Buku Teks