Perry, Philippa, author
Renebook, 2022
Buku Teks
Neuharth, Dan, author
HarperCollins, 2002
Buku Teks
Nomi, Toshikata, author
Mizan Media utama, 2017
Buku Teks
Lowen, Walter
Greystone Press, 1958
Buku Teks
Lancaster, F. Wilfrid, author
Uninersity of Illinois, 1993
Buku Teks