Hi Vera,
On researching my Reviews and 'Pal's
I use not only IMDb and The New York Times,
but also some 15 books, The Big Trail,
and the journals of the John Wayne Film Society.
The book you mention is
The Young Duke: The Early Life of John Wayne
(Hardcover)
by Chis Enss, Howard Kazanjian.
208 Pages
Published with the help of the Wayne Family,
includes unpublished, family photographs,
and personal memories.
Priced at £14.95 plus post and pacakage £3.00
available also from the John Wayne Film Society
Here is their link:-
and here is the Amazon link:-