Gibson system for guitar, Hawaiian guitar, banjo, mandolin

I have what appears to be a complete copy of "GIBSON SYSTEM FOR HAWAIIAN GUITAR". The copyright date is 1937. I'm not cetain who is the author of the book; however there is an endorsement on the back cover by Alvino Rey. Evan White also is mentioned, a music teacher, but I cannot be sure who is the author of the book's contents. The book is not bound. All pages are three hole punched. The cover of the book has the word "ENCHANTMENT" written on it. The total pages is 76 plus several pages about music and one's attitude about it. I could go on and on about it, but I would like to know its value, and would like to sell it for market value.