Roberts, A. D. (1975). Educational innovation: Alternatives in curriculum and instruction. Allyn and Bacon.
Chicago-viite (17. p.)Roberts, Arthur D. Educational Innovation: Alternatives in Curriculum and Instruction. Boston: Allyn and Bacon, 1975.
MLA-viite (8. p.)Roberts, Arthur D. Educational Innovation: Alternatives in Curriculum and Instruction. Allyn and Bacon, 1975.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.