APA-referens (7:e uppl.)

(1990). Logo Programming, Problem Solving, and Knowledge-Based Instruction Karen Swan and John B. Black. [microform].

Chicago-referens (17:e uppl.)

Logo Programming, Problem Solving, and Knowledge-Based Instruction Karen Swan and John B. Black. [microform]. 1990.

MLA-referens (9:e uppl.)

Logo Programming, Problem Solving, and Knowledge-Based Instruction Karen Swan and John B. Black. [microform]. 1990.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.