Otto, W., & Koenke, K. (1969). Remedial teaching: Research and comment. Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Otto, Wayne, agus Karl Koenke. Remedial Teaching: Research and Comment. Boston: Houghton Mifflin, 1969.
Lua MLA (8ú heag.)Otto, Wayne, agus Karl Koenke. Remedial Teaching: Research and Comment. Houghton Mifflin, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.