Over the years, I have accumulated a comprehensive collection of publications about castles and other fortifications, which has proven invaluable for my personal exploration and as a resource for this website. These are the ones about Oman.
Forts of Oman by W. Dinteman (Motivate Publishing) in English isbn 1-873544-41-3
Khasab Castle by unknown (Ministry of Tourism) in English isbn n/a
Sohar Fort Museum by unknown (Ministry of National Heritage and Culture) in English isbn n/a