APA Style

Irwin, D, M., Bushnell, M, M. (1980). Observational strategies for child study (1). New York: Holt, Rinehart and Winston.

MLA Style

Irwin, D., Michelle., Bushnell, M., Margaret. "Observational strategies for child study". 1 New York: Holt, Rinehart and Winston, 1980. Text.