1. The first source of knowledge was Wikipedia, where You can find quite good description of Janggi rules:
  2. Very helpfull was also blog of Mr Antoni: (but it is in Polish only)
  3. Another source that I found thanks to Mr Antoni was the book: “Introduction to Korean Chess” C.McDade
  4. Another source of information was the page:
  5. I have found also a german book “Schachspiele in Ostasien – Xiangqi, Changgi, Shogi” author Peter Banaschak (link below):
    Schachspiele in Ostasien – Xiangqi, Changgi, Shogi.