Thornburg, Ryan, author
CQ Press, 2011
Buku Teks
Yates, Edward D., author
Contemporary Publishing Company, 1981
Buku Teks
Ricketson, Matthew, author
Allen & Unwin, 2017
Buku Teks
Bryson, Bill, author
Penguin Books, 1994
Buku Referensi
Turabian, Kate L., author
University of Chicago Press, 1982
Buku Teks