Ingersoll, R. J. (1988). The enrollment problem: Proven management techniques / Ronald J. Ingersoll.
Lua i Stíl Chicago (17ú heag.)Ingersoll, Ronald J. The Enrollment Problem: Proven Management Techniques / Ronald J. Ingersoll. New York : American Council on Education, 1988.
Lua MLA (9ú heag.)Ingersoll, Ronald J. The Enrollment Problem: Proven Management Techniques / Ronald J. Ingersoll. 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.