Παραπομπή σε μορφή APA (7η εκδ.)

Fitzhugh, K., & Fitzhugh, L. (1966). Fitzhugh PLUS program: Perceptual learning and understanding skills. Allied Educational Council.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Fitzhugh, Kathleen, και Loren Fitzhugh. Fitzhugh PLUS Program: Perceptual Learning and Understanding Skills. Galien, Mich.: Allied Educational Council, 1966.

Παραπομπή σε μορφή MLA (8th εκδ.)

Fitzhugh, Kathleen, και Loren Fitzhugh. Fitzhugh PLUS Program: Perceptual Learning and Understanding Skills. Allied Educational Council, 1966.