Παραπομπή σε μορφή APA (7η εκδ.)

O'Hara, R. A. (1991). Guide to highway law for architects, engineers, surveyors, and contractors. E & FN Spon.

Παραπομπή σε μορφή Chicago (17η εκδ.)

O'Hara, Robert A. Guide to Highway Law for Architects, Engineers, Surveyors, and Contractors. London ; New York: E & FN Spon, 1991.

Παραπομπή σε μορφή MLA (8th εκδ.)

O'Hara, Robert A. Guide to Highway Law for Architects, Engineers, Surveyors, and Contractors. E & FN Spon, 1991.