Ellsworth, R. E. (1970). The School library: Facilities for independent study in the secondary school. Educational Facilities Laboratories.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ellsworth, Ralph E. The School Library: Facilities for Independent Study in the Secondary School. U.S.A: Educational Facilities Laboratories, 1970.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Ellsworth, Ralph E. The School Library: Facilities for Independent Study in the Secondary School. Educational Facilities Laboratories, 1970.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.