Hugh (1975), Bird Stampsof the World Check-List, ISBN 0950476803 Collect BirdsonStamps, 2002, ISBN 9780852595329 BIRDSONSTAMPS Медиафайлы на Викискладе
(SAKURA Catalog of Japanese Stamps 1983. 18th Edition. Edited and Published by the Japan Philatelic Society, Inc. 05.09.1982. The size of B6 (128 × 182 mm)