Krug, E. A. (1950). Curriculum planning. Harper.
Lua i Stíl Chicago (17ú heag.)Krug, Edward A. Curriculum Planning. New York: Harper, 1950.
Lua MLA (8ú heag.)Krug, Edward A. Curriculum Planning. Harper, 1950.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.