Crabtree, B. (2010). Search for sustainablity with no-till Bill in dryland agriculture. Crabtree Agriculture Consulting.
استشهاد بنمط شيكاغوCrabtree, Bill. Search for Sustainablity With No-till Bill in Dryland Agriculture. Crabtree Agriculture Consulting, 2010.
MLA استشهادCrabtree, Bill. Search for Sustainablity With No-till Bill in Dryland Agriculture. Crabtree Agriculture Consulting, 2010.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.