World Association of Perinatal Medicine. (1973). Journal of Perinatal Medicine. Walter de Gruyter.
Citação do estilo Chicago (17ª ed.)World Association of Perinatal Medicine. Journal of Perinatal Medicine. Berlin: Walter de Gruyter, 1973.
Citação MLA (8ª ed.)World Association of Perinatal Medicine. Journal of Perinatal Medicine. Walter de Gruyter, 1973.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.