Dear Linda,
Integrative review is the methodology that provides synthesis of knowledge and applicability of results of significant studies to practice. Here are a few of related sources for you to retrieve:
Whittemore R, Knafl K (2005). The integrative review: updated methodology. J Adv Nurs. 2005 Dec;52(5):546-53.
Marcela Tavares de Souza, Michelly Dias da Silva & Rachel de Carvalho. (2010) Integrative review: what is it? How to do it? (Review) in Einstein, 2010; 8(1 Pt 1):102-6
Ganong LH. (1987). Integrative reviews of nursing research. Res Nurs Health. 1987;10(1):1-11.
Broome M.E. (1993) Integrative literature reviews for the development of concepts. In Concept Development in Nursing, 2nd edn (Rodgers B.L. & Knafl K.A., eds), W.B. Saunders Co., Philadelphia, PA, pp. 231–250.
I hope the sources related can assist you in understanding the integrative review.
Regards;
Quah Cheng Sim