- Zaccaria، J. S. "١٩٦٥". Developmental tasks: Implications for the goals

of guidance. Personnel & Guidance Journal، ٤٤، ٣٧٢ - ٣٧٥.

- Zahran Hamed "١٩٦٤". An Investigation of Some Aspects of Personality with Reference to the Psychological Guidance of Blind Children. M. A. Thesis. University of London.

- Zahran، Hamed "١٩٦٥". A study of personality differences between blind and sighted children. British Journal of Educational Psychology، ٣٥، ٣٢٩-٣٣٨.

- Zahran، Hamed "١٩٦٦". The Self - Concept in Relation to the Psychological Guidance of Adolescents: An Experimental Study. Ph. D. Thesis. University of London.

- Zahran، Hamed "١٩٦٧". The self - concept in the psychological guidance of adolescents. British Journal of Educational Psychology، ٣٧، ٢٢٥ - ٢٤٠.