APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (8. p.)

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