Washington State University. Extension Service & Wichers, H. E. (1950). Minimum standards for good farm houses located in the state of Washington.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Washington State University. Extension Service و Henry Evert Wichers. Minimum Standards for Good Farm Houses Located in the State of Washington. Pullman, Wash, 1950.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Washington State University. Extension Service و Henry Evert Wichers. Minimum Standards for Good Farm Houses Located in the State of Washington. 1950.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.