The Elemental Magic Workbook: An Experimental Guide to Understanding and Working with the Classical Elements is available for purchase through Amazon, Barnes & Noble, and Megalithica Books. You can learn more about the book as well as view bonus content here.

I am currently working on a second book, which will explore the planets (classical and otherwise) in the same spirit as with the elements in The Elemental Magic Workbook. You can learn more about The Planetary Magic Workbook here.