Engel, C. E., Ewan, C. E., & Bennett, M. J. (1980). Proceedings of the intercountry workshop on the development of instructional materials: Sponsored by the World Health Organization and held at the WHO Western Pacific Regional Teacher Training Centre for Health Personnel, University of New South Wales, 3-15 February 1980. [s.n.] : printed and distributed by the University of New South Wales.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Engel, C. E., Christine E. Ewan, و Michael J. Bennett. Proceedings of the Intercountry Workshop on the Development of Instructional Materials: Sponsored by the World Health Organization and Held at the WHO Western Pacific Regional Teacher Training Centre for Health Personnel, University of New South Wales, 3-15 February 1980. [Sydney, N.S.W.]: [s.n.] : printed and distributed by the University of New South Wales, 1980.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Engel, C. E., et al. Proceedings of the Intercountry Workshop on the Development of Instructional Materials: Sponsored by the World Health Organization and Held at the WHO Western Pacific Regional Teacher Training Centre for Health Personnel, University of New South Wales, 3-15 February 1980. [s.n.] : printed and distributed by the University of New South Wales, 1980.