Walford, A. J. Guide to Reference Material (3rd ed.). The Library Association.
Chicago Stili AlıntıWalford, A J. Guide to Reference Material. 3rd ed. London: The Library Association.
MLA AlıntıWalford, A J. Guide to Reference Material. 3rd ed. The Library Association.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..