Gaya APA

Walker, L, O., Avant, K, C. (2005). Strategies for theory construction in nursing 4th ed (4). New Jersey: Pearson Education.

Gaya MLA

Walker, Lorraine, Olszewski., Avant, Kay, Coalson. "Strategies for theory construction in nursing 4th ed". 4 New Jersey: Pearson Education, 2005. Text.