International Seminar on Approval and Gathering Plans in Large and Medium Size Academic Libraries, 3rd., West Palm Beach, Fla., 1971, Spyers-Duran, P., & Gore, D. (1972). Economics of approval plans: Proceedings. Greenwood Press.
Lua i Stíl Chicago (17ú heag.)International Seminar on Approval and Gathering Plans in Large and Medium Size Academic Libraries, 3rd., West Palm Beach, Fla., 1971, Peter Spyers-Duran, agus Daniel Gore. Economics of Approval Plans: Proceedings. Westport, Conn: Greenwood Press, 1972.
Lua MLA (9ú heag.)International Seminar on Approval and Gathering Plans in Large and Medium Size Academic Libraries, 3rd., West Palm Beach, Fla., 1971, et al. Economics of Approval Plans: Proceedings. Greenwood Press, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.