Álvarez, P., & Cárdenas, H. (2006). Situation of corn and bean production at Pejibaye of Perez Zeledon, and Pilas of Buenos Aires, Costa Rica.
استشهاد بنمط شيكاغوÁlvarez, Pablo, و Hernando Cárdenas. Situation of Corn and Bean Production At Pejibaye of Perez Zeledon, and Pilas of Buenos Aires, Costa Rica. 2006.
MLA استشهادÁlvarez, Pablo, و Hernando Cárdenas. Situation of Corn and Bean Production At Pejibaye of Perez Zeledon, and Pilas of Buenos Aires, Costa Rica. 2006.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.