Gaya APA

RN., S, J, P, P, R, T, S, B, P. (2004). Middle range theories: application to nursing research . Philadephia: Lippincott Williams and Wilkins.

Gaya MLA

RN., Sandra, J., Peterson,, PhD.,, RN.,, Timothy, S., Bredow,, PhD.,. "Middle range theories: application to nursing research". Philadephia: Lippincott Williams and Wilkins, 2004. Text.