APA-referens (7:e uppl.)
SINGER, G., & ET AL. (1999). A MULTI-SITE EVALUATION OF PARENT TO PARENT PROGRAMS FOR PARENTS OF CHILDREN WITH DISABILITIES.
Chicago-referens (17:e uppl.)
SINGER, G.H.S, och ET AL. A MULTI-SITE EVALUATION OF PARENT TO PARENT PROGRAMS FOR PARENTS OF CHILDREN WITH DISABILITIES. 1999.
MLA-referens (9:e uppl.)
SINGER, G.H.S, och ET AL. A MULTI-SITE EVALUATION OF PARENT TO PARENT PROGRAMS FOR PARENTS OF CHILDREN WITH DISABILITIES. 1999.
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