Gerlach, V. S. (1971). Teaching and media: A systematic approach. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Gerlach, Vernon S. Teaching and Media: A Systematic Approach. Englewood Cliffs: Prentice-Hall, 1971.
Lua MLA (9ú heag.)Gerlach, Vernon S. Teaching and Media: A Systematic Approach. Prentice-Hall, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.