These are the books and reference materials that I used in learning Korean. I have a handful and honestly I have not read everything compeletely. I will try to post all these materials and provide my opinion on its usability in the point of view of a self-learner.
Most of the books I have were bought out of the country as there are limited Korean books being offered in the local bookstores. Two of my staple books were bought from Singapore’s Kinokuniya while other supplementary reference materials were bought in Kyeobo (겨보) Bookstore in Seoul. These are all available on-line via Amazon or Barnes but as you know shipping cost will bloat the price so in my official and leisure travel, I maximize the opportunity by checking on bookstores to get these materials. I also sometimes ask friends, who go out of the country or is based in another country, the favor of buying for you books which are not found locally.
I also have reference materials provided when I attended formal schooling at the University of the Philippines. They are using Kyunghee University text book which in workbook type.
Please continue to visit this page as I will add under this all the books that I am done reading. Please don’t take these evaluation as professional advice but rather just two cents from someone who experienced learning on on her own.