{{Cite journal| doi = 10.1093/heapol/czx035| issn = 1460-2237| volume = 32| issue = 7| pages = 1002–1014| last1 = Robert| first1 = Emilie| last2 = Samb| first2 = Oumar Mallé| last3 = Marchal| first3 = Bruno| last4 = Ridde| first4 = Valéry| title = Building a middle-range theory of free public healthcare seeking in sub-Saharan Africa: a realist review| journal = Health Policy and Planning| date = 2017-05-16}}