4+ Publication. No.23 "Fairey Gannet - Anti-submarine and Strike variants AS.Mk.1, AS.Mk.4" by Martin Velek. Published by MARK 1 Ltd., PO Box 10, 10031 Prague 10 - Strasnice, Czech Republic. (c) MARK 1 Ltd., 1st edition, Prague 2007. ISBN 978-80-86637-04-4