University of Wisconsin. Center for Studies in Vocational and Technical Education, Somers, G. G., & Little, J. K. (1971). Vocational education: Today and tomorrow. Center for Studies in Vocational and Technical Education, University of Wisconsin.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)University of Wisconsin. Center for Studies in Vocational and Technical Education, Gerald George Somers, و J. Kenneth Little. Vocational Education: Today and Tomorrow. [Madison]: Center for Studies in Vocational and Technical Education, University of Wisconsin, 1971.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)University of Wisconsin. Center for Studies in Vocational and Technical Education, et al. Vocational Education: Today and Tomorrow. Center for Studies in Vocational and Technical Education, University of Wisconsin, 1971.