APA-referens (7:e uppl.)
HELMSTETTER, E., & ET AL. (1998). COMPARISON OF GENERAL AND SPECIAL EDUCATION CLASSROOMS OF STUDENTS WITH SEVERE DISABILITIES.
Chicago-referens (17:e uppl.)
HELMSTETTER, E., och ET AL. COMPARISON OF GENERAL AND SPECIAL EDUCATION CLASSROOMS OF STUDENTS WITH SEVERE DISABILITIES. 1998.
MLA-referens (9:e uppl.)
HELMSTETTER, E., och ET AL. COMPARISON OF GENERAL AND SPECIAL EDUCATION CLASSROOMS OF STUDENTS WITH SEVERE DISABILITIES. 1998.
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