Vogel, J. P., Chawanpaiboon, S., Watananirun, K., Lumbiganon, P., Petzold, M., Moller, A., . . . Gülmezoglu, A. M. (2016). Global, regional and national levels and trends of preterm birth rates for 1990 to 2014: Protocol for development of World Health Organization estimates. Reprod Health.
शिकागो स्टाइल उद्धरणVogel, Joshua P., et al. "Global, Regional and National Levels and Trends of Preterm Birth Rates for 1990 to 2014: Protocol for Development of World Health Organization Estimates." Reprod Health 2016.
एमएलए उद्धरणVogel, Joshua P., et al. "Global, Regional and National Levels and Trends of Preterm Birth Rates for 1990 to 2014: Protocol for Development of World Health Organization Estimates." Reprod Health 2016.
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