APA

Betrán A. P., Say L., Gülmezoglu A. M., Allen T. & Hampson L. (20051109). Effectiveness of different databases in identifying studies for systematic reviews: experience from the WHO systematic review of maternal morbidity and mortality. : BMC medical research methodology.

Chicago

Betrán Ana P, Say Lale, Gülmezoglu A Metin, Allen Tomas and Hampson Lynn. 20051109. Effectiveness of different databases in identifying studies for systematic reviews: experience from the WHO systematic review of maternal morbidity and mortality. : BMC medical research methodology.

Harvard

Betrán A. P., Say L., Gülmezoglu A. M., Allen T. and Hampson L. (20051109). Effectiveness of different databases in identifying studies for systematic reviews: experience from the WHO systematic review of maternal morbidity and mortality. : BMC medical research methodology.

MLA

Betrán Ana P, Say Lale, Gülmezoglu A Metin, Allen Tomas and Hampson Lynn. Effectiveness of different databases in identifying studies for systematic reviews: experience from the WHO systematic review of maternal morbidity and mortality. : BMC medical research methodology. 20051109.