APA (7th ed.) Citation

Pennypacker, A. K., & Driscoll, R. M. (1972). The Crucial Factor in Individualizing Instruction.

Chicago Style (17th ed.) Citation

Pennypacker, Arabelle K., and Richard M. Driscoll. The Crucial Factor in Individualizing Instruction. 1972.

MLA (9th ed.) Citation

Pennypacker, Arabelle K., and Richard M. Driscoll. The Crucial Factor in Individualizing Instruction. 1972.

Warning: These citations may not always be 100% accurate.