Grayum, M. H. (2027). Paul C. Standley: A century after his botanical work in Costa Rica.
استشهاد بنمط شيكاغوGrayum, Michael H. Paul C. Standley: A Century After His Botanical Work in Costa Rica. 2027.
MLA استشهادGrayum, Michael H. Paul C. Standley: A Century After His Botanical Work in Costa Rica. 2027.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.