International Portage Conference Tokyo & Japan Portage Association. (1989). A challenge to potentiality: The vision of early intervention for developmentally delayed children : proceedings of the 1988 International Portage Conference in Tokyo, July 29-31, 1988. Japan Portage Association.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিInternational Portage Conference Tokyo এবং Japan Portage Association. A Challenge to Potentiality: The Vision of Early Intervention for Developmentally Delayed Children : Proceedings of the 1988 International Portage Conference in Tokyo, July 29-31, 1988. [Tokyo: Japan Portage Association, 1989.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিInternational Portage Conference Tokyo এবং Japan Portage Association. A Challenge to Potentiality: The Vision of Early Intervention for Developmentally Delayed Children : Proceedings of the 1988 International Portage Conference in Tokyo, July 29-31, 1988. Japan Portage Association, 1989.