Blokpoel, H. (1976). Bird hazards to aircraft: Problems and prevention of bird/aircraft collisions. Clarke Irwin ; Canadian Wildlife Service, Environment Canada : Pub. Centre, Supply and Services Canada.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBlokpoel, H. Bird Hazards to Aircraft: Problems and Prevention of Bird/aircraft Collisions. Toronto : [Ottawa]: Clarke Irwin ; Canadian Wildlife Service, Environment Canada : Pub. Centre, Supply and Services Canada, 1976.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBlokpoel, H. Bird Hazards to Aircraft: Problems and Prevention of Bird/aircraft Collisions. Clarke Irwin ; Canadian Wildlife Service, Environment Canada : Pub. Centre, Supply and Services Canada, 1976.
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