Gaya APA
Joel, H. (1981).
Special Devices for Hard of Hearing Deaf And Deaf-Blind Persons .
America:
Joel Hurvizt And Richard Carmen.
Gaya MLA
Joel, Hurvitz.
"Special Devices for Hard of Hearing Deaf And Deaf-Blind Persons".
America:
Joel Hurvizt And Richard Carmen,
1981.
Text.