APA-referens (7:e uppl.)

Helmberg, G. (2007). Getting acquainted with fractals. Walter de Gruyter.

Chicago-referens (17:e uppl.)

Helmberg, Gilbert. Getting Acquainted with Fractals. Berlin ; New York: Walter de Gruyter, 2007.

MLA-referens (9:e uppl.)

Helmberg, Gilbert. Getting Acquainted with Fractals. Walter de Gruyter, 2007.