Osborn, J. E., & Hoelscher, W. H. (1969). Expected production requirements, cost and returns for major vegetable crops: Coarse textured soils, rolling plains of Texas. Dept. of Agricultural Economics, Texas Tech University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Osborn, James E., و Wilfred H. Hoelscher. Expected Production Requirements, Cost and Returns for Major Vegetable Crops: Coarse Textured Soils, Rolling Plains of Texas. Lubbock: Dept. of Agricultural Economics, Texas Tech University, 1969.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Osborn, James E., و Wilfred H. Hoelscher. Expected Production Requirements, Cost and Returns for Major Vegetable Crops: Coarse Textured Soils, Rolling Plains of Texas. Dept. of Agricultural Economics, Texas Tech University, 1969.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.