Gaya APA

Frymoyer, J, W., Gordon, S, L. (1989). New Perspectives On Low Back Pain . Illinois: American Academy of Orthopaedic Surgeons.

Gaya MLA

Frymoyer, John, W., Gordon, Stephen, L. "New Perspectives On Low Back Pain". Illinois: American Academy of Orthopaedic Surgeons, 1989. print.