Não informado. (1990). European Journal of Companion Animal Practice. Federation of European Companion Animal Veterinary Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. European Journal of Companion Animal Practice. Paris: Federation of European Companion Animal Veterinary Association, 1990.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. European Journal of Companion Animal Practice. Federation of European Companion Animal Veterinary Association, 1990.
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