Freeman, H. (1974). A preliminary study of the behaviour of captive snow leopards (Panthera uncia). In International Zoo Yearbook (Vol. 15, pp. 217–222).
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O'Connor, T., & Freeman, H. (1982). Maternal behavior and behavioral development in the captive snow leopard (Panthera uncia). In L. Blomqvist (Ed.), International Pedigree Book of Snow Leopards, Vol. 3 (Vol. 3, pp. 103–110). Helsinki: Helsinki Zoo.
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Freeman, H. (1990). The view from here: permit hunting of snow leopards. Snow Line, (Winter), 2–3.
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Freeman, H. (1988). Proceedings of the Fifth International Snow Leopard Symposium. India: International Snow Leopard Trust and Wildlife Institute of India.
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Freeman, H. (1988). Introduction to the Fifth International Snow Leopard Symposium. In H.Freeman (Ed.), (ix). International Snow Leopard Trust and Wildlife Institute of India.
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Freeman, H. (1982). Characteristics of the social behavior in the snow leopard. In L. Blomqvist (Ed.), International Pedigree Book of Snow Leopards, Vol. 3 (Vol. 3, pp. 117–120). Helsinki: Helsinki Zoo.
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Freeman, H. (1980). Snow leopard: a cooperative study between zoos. In L. Blomqvist (Ed.), International Pedigree Book of Snow Leopards (Vol. 2, pp. 127–136). Helsinki: Helsinki Zoo.
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Freeman, H. (1980). The snow leopard, today and yesterday. In L. Blomqvist (Ed.), International Pedigree Book of Snow Leopards, Vol. 2 (Vol. 2, pp. 37–43). Helsinki: Helsinki Zoo.
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Freeman, H., & Hutchins, M. (1978). Captive Management of Snow Leopard Cubs. Der Zoologischer Garten, 48, 49–62.
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Freeman, H. (1988). Resolutions Conservation of Snow Leopard, Fifth International Snow Leopard Symposium. (pp. 267–269). Usa.
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