MicroWorld of Diamonds(1st Edition) A Visual Reference by John I. Koivula Hardcover, 157 Pages, Published 2000 by Gemworld International ISBN-13: 978-0-9641733-5-4, ISBN: 0-9641733-5-2
Geologica Earth's Dynamic Forces (Geological Time, Supercontinents, Climate, Landforms, Animals, Plants) by Dr-Robert-R-Coenraads, John I. Koivula, Robert Raymond Coenraads Hardcover, 576 Pages, Published 2007 by Millennium House ISBN-13: 978-1-921209-06-2, ISBN: 1-921209-06-2