Gaya APA

Turner, J, S., Helms, D, B. (1991). Lifespan development (4th ed). Fort Worth: Holt, Rinehart and Winston.

Gaya MLA

Turner, Jeffrey, S.., Helms, Donald, B.. "Lifespan development". 4th ed Fort Worth: Holt, Rinehart and Winston, 1991. Text.