Info at CiNii. - English abstract available on pages 10-12 of 12 Articles by former staff members Ishikawa, Yasuo (石川 泰雅; 前ハノイ日本人学校教諭・埼玉県埼玉郡宮代町立須賀中学校教諭).
Info at CiNii. - English abstract available on pages 10-12 of 12 Bài viết của cựu nhân viên Ishikawa, Yasuo (石川 泰雅; 前ハノイ日本人学校教諭・埼玉県埼玉郡宮代町立須賀中学校教諭).