Gallup, A. C., & Eldakar, O. T. (2011). Contagious Yawning and Seasonal Climate Variation. Frontiers Research Foundation.
استشهاد بنمط شيكاغوGallup, Andrew C., و Omar Tonsi Eldakar. Contagious Yawning and Seasonal Climate Variation. Frontiers Research Foundation, 2011.
MLA استشهادGallup, Andrew C., و Omar Tonsi Eldakar. Contagious Yawning and Seasonal Climate Variation. Frontiers Research Foundation, 2011.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.