Jordan, R. R., author
Longman, 2001
Buku Teks SO
editors, Junaidi, Elda N. Auliansani, Farah S. Azizah, M. Umar Sadikin
UI Publishing, 2020
Buku Teks
Oshima, Alice, author
Pearson Longman, 2006
Buku Teks
Trzeciak, John, author
Phoenix, 1997
Buku Teks
Scholastic, 1987
Buku Teks SO