Pierce, P. E. (1972). Make Your Own Library Skill Reinforcers.
Cita Chicago Style (17a ed.)Pierce, Preston E. Make Your Own Library Skill Reinforcers. 1972.
Cita MLA (9a ed.)Pierce, Preston E. Make Your Own Library Skill Reinforcers. 1972.
Precaución: Estas citas no son 100% exactas.