Gaya APA

Nicoll, P, G, R, N, B, C, S, L, H. (2003). Perspectives on nursing theory (4). Philadephia: Lippincott Williams Wlkins.

Gaya MLA

Nicoll, Pamela, G., Reed,, Nelma, B., Crawford, Shearer,, Leslie, H.. "Perspectives on nursing theory". 4 Philadephia: Lippincott Williams Wlkins, 2003. Text.