Crabb, G. (1976). Copyright clearance: A practical guide. Council for Educational Technology for the United Kingdom : Distributed by Councils and Education Press.
Lua i Stíl Chicago (17ú heag.)Crabb, Geoffrey. Copyright Clearance: A Practical Guide. London: Council for Educational Technology for the United Kingdom : Distributed by Councils and Education Press, 1976.
Lua MLA (8ú heag.)Crabb, Geoffrey. Copyright Clearance: A Practical Guide. Council for Educational Technology for the United Kingdom : Distributed by Councils and Education Press, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.