Gaya APA

Olson, W, H., Brumback, R, A. (1989). Handbook of Symptom-Oriented Neurology (2). America: United States.

Gaya MLA

Olson, William, H.., Brumback, Roger, A.. "Handbook of Symptom-Oriented Neurology". 2 America: United States, 1989. Text.