Παραπομπή σε μορφή APA (7η εκδ.)

Lean, G. A. (1980). The training of spatial abilities: A bibliography. Mathematics Education Centre, Papua New Guinea University of Technology.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Lean, G. A. The Training of Spatial Abilities: A Bibliography. Lae: Mathematics Education Centre, Papua New Guinea University of Technology, 1980.

Παραπομπή σε μορφή MLA (9th εκδ.)

Lean, G. A. The Training of Spatial Abilities: A Bibliography. Mathematics Education Centre, Papua New Guinea University of Technology, 1980.