Buckland, R.; Guy, G., eds. (2002). «Origins and Breeds of Domestic Geese». Goose Production. Col: FAO Animal Production and Health Paper. 154. Rome: Food and Agriculture Organization of the United Nations. ISBN9-2510-4862-2. ISSN0254-6019
Hugo, Susanne (1995). «Geese: the underestimated species». Rearing unconventional livestock species: a flourishing activity. Col: World Animal Review. 85. Rome: Food and Agriculture Organization of the United Nations. OCLC1012568698
Grandolini, A. «Indo-Chinese Fighting 'Cats: Grumman's Superb Bearcat in Vietnam». Air Enthusiast. ISSN0143-5450