Roberts, A. D. (1975). Educational innovation: Alternatives in curriculum and instruction. Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Roberts, Arthur D. Educational Innovation: Alternatives in Curriculum and Instruction. Boston: Allyn and Bacon, 1975.
Lua MLA (8ú heag.)Roberts, Arthur D. Educational Innovation: Alternatives in Curriculum and Instruction. Allyn and Bacon, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.