Ann N. Crigler, editor
The University of Michigan Press, 2001
Buku Teks
Cole, Luella
Holt Rinehart and Winston, 1959
Buku Teks
Hannan, Bill
George Allen and Unwin, 1985
Buku Teks
Putera Anarta Mardanadi
Fakultas Teknik Universitas Indonesia, 2008
UI - Skripsi Open
oleh Martha L. Cottam, Beth Dietz-Uhler, Elena Mastors, dan Thomas Preston; penerjemah, Ellys Tjo
Rajawali, 2012
Buku Teks SO