Papyrus, author
Elex Media Komputindo, 2019
Buku Teks
Miller, James A.
Westview Press, 1984
Buku Teks
Munro, Alice, author
Katta, 2014
Buku Teks
Shepherd, Roger, author
Seoul Selection, 2011
Buku Teks
Easwaran, Eknath, author
Gramedia Pustaka Utama , 2001
Buku Teks