Well it is too much honor for this parasite site to quote them, they might think there is a need for their illegal work. I note the copyright 2001 and the blurb 'No part of this work may be reproduced or used in any forms or by any means - graphic, electronic or mechanical, including photocopying or information storage and retrieval systems - without written permission from the copyright holder
A just reference would be page 176 (Langley Smithers monoplane)
Goodall, Michael H., and Albert E. Tagg. 2001. British aircraft before the great war. Atglen: Schiffer Publishing. ISBN 978-0-7643-1207-3
Quoting the book would probably not help to get Schiffer so far as to let write comparable books for German or Italian or Russian etc. aviation before the Great war, but it does not hurt either.