The HP 126 multi-view and the 134 artists impression are from
Handley Page Aircraft since 1907 by CH Barnes, Putnam 2nd ed 1987.
The multi-view and internal view of the 134 are from Stuck on the Drawing Board
by Richard Payne, Tempus 2004.
As to design influence on the 126 one needn't go off the farm as H-P had the earlier HP117
work to draw from.
Jon