"La méthode Harrap's est une nouvelle méthode, fondée sur une pédagogie originale et novatrice. Elle offre la possibilité à tous de bien comprendre, écrire et surtout parler un arabe actuel et courant."
New Organic Chemistry(Updated) by Harry Law Heys Paperback, 384 Pages, Published 1982 by George G.Harrap & Co Ltd ISBN-13: 978-0-245-53864-3, ISBN: 0-245-53864-X
Remember Henry Harris Lost Icon of a Revolution: A Story of Hope and Self-Sacrifice in America by Sam Heys Paperback, 362 Pages, Published 2019 by Black Belt Books ISBN-13: 978-0-578-56578-1, ISBN: 0-578-56578-1
Why Me? by Graham Heys Paperback, 32 Pages, Published 2012 by Lulu.Com ISBN-13: 978-1-4466-0945-3, ISBN: 1-4466-0945-6
"This is an autobiographical account by the author explaining his understanding of why he became mentally ill and what happened to him over a period of years on a road to recovery and wellness. From birth to the present day."
Physical Chemistry(Updated) by Harry Law Heys Paperback, 510 Pages, Published 1985 by Nelson Thornes Ltd ISBN-13: 978-0-17-444298-1, ISBN: 0-17-444298-X