Kasai, Omasu (January 1994). Gēmudezainā nyūmon ゲームデザイナー入門 [Introduction to Game Design] (in Japanese). Tokyo, Japan: Shogakukan. ISBN978-4-09-220205-4. (Translated by Shmuplations. Archived on 2022-01-22. Retrieved on 2023-03-14)
Kasai, Omasu (January 1994). Gēmudezainā nyūmon ゲームデザイナー入門 [Introduction to Game Design] (in Japanese). Tokyo, Japan: Shogakukan. ISBN978-4-09-220205-4. (Translated by Shmuplations. Archived on 2022-01-22. Retrieved on 2023-03-14)