Breukelman, J., & Frazier, R. P. (1961). Offerings and enrollments in the secondary school sciences: In Kansas in 1960-1961. Graduate Division, Kansas State Teachers College.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Breukelman, John, و Ralph Paul Frazier. Offerings and Enrollments in the Secondary School Sciences: In Kansas in 1960-1961. Emporia: Graduate Division, Kansas State Teachers College, 1961.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Breukelman, John, و Ralph Paul Frazier. Offerings and Enrollments in the Secondary School Sciences: In Kansas in 1960-1961. Graduate Division, Kansas State Teachers College, 1961.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.