Gaya APA

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

Gaya Chicago

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

Gaya MLA

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

Gaya Turabian

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