Armstrong, Michael, author
[Publisher not identified], [Date of publication not identified]
Buku Teks
Hunsaker, Phillip L., author
A Touchstone Book, 1986
Buku Teks
Giesecke, Joan, author
[American Library association, American Library association], 2001
eBooks
Beach, Dale S., author
Macmillan, 1980
Buku Teks
Honey, Peter, author
McGraw-Hill, 1980
Buku Teks