Παραπομπή APA

Portalupi, S., von Elm, E., Schmucker, C., Lang, B., Motschall, E., Schwarzer, G., . . . Meerpohl, J. J. (2013). Protocol for a systematic review on the extent of non-publication of research studies and associated study characteristics. BioMed Central.

Παραπομπή Chicago Style

Portalupi, Susan, et al. Protocol for a Systematic Review On the Extent of Non-publication of Research Studies and Associated Study Characteristics. BioMed Central, 2013.

Παραπομπή MLA

Portalupi, Susan, et al. Protocol for a Systematic Review On the Extent of Non-publication of Research Studies and Associated Study Characteristics. BioMed Central, 2013.

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