"浦和FW石原直樹が右ひざ前十字じん帯損傷で手術…全治約6カ月" [Urawa FW Naoki Ishihara undergoes surgery for right knee anterior cruciate ligament injury... Full recovery in about 6 months]. www.soccer-king.jp (in Japanese).
"湘南、DF岡本拓也がキャプテン就任! 副キャプテンには東京五輪世代の齊藤未月ら" [Shonan DF Takuya Okamoto appointed captain! Vice-captains include Tokyo Olympics generation member Mitsuki Saito]. www.soccer-king.jp (in Japanese).
"湘南、石原直樹氏のU-15コーチ就任を発表「指導者の道を歩むことと…」" [Shonan announces appointment of Naoki Ishihara as U-15 coach: "I want to pursue a career as a coach..."]. www.soccer-king.jp (in Japanese).
"【ライターコラムfrom仙台】日々の積み重ねを大切に…石原直樹が広島戦で見せた姿勢" [[Writer's column from Sendai] The importance of daily accumulation...Naoki Ishihara's attitude in the match against Hiroshima]. www.soccer-king.jp (in Japanese).
sponichi.co.jp
"大みそかに発表!湘南・石原が大宮入り" [Announced on New Year's Eve! Shonan's Ishihara arrives at Omiya] (in Japanese). Archived from the original on 15 June 2009.
"浦和8強!7カ月ぶり復帰石原に"祝砲"7発で大勝" [Urawa reaches the quarterfinals! A big win for Ishihara, who returns after seven months, with seven "congratulatory shots"]. www.sponichi.co.jp (in Japanese).
urawa-reds.co.jp
"石原直樹選手 完全移籍加入のお知らせ" [Announcement of permanent transfer of Naoki Ishihara]. www.urawa-reds.co.jp (in Japanese).
"石原直樹 出場停止のお知らせ" [Notice of suspension of Naoki Ishihara]. www.urawa-reds.co.jp (in Japanese).
vegalta.co.jp
"浦和レッズ 石原直樹選手 期限付き移籍加入のお知らせ" [Naoki Ishihara joins Urawa Red Diamonds on loan]. www.vegalta.co.jp (in Japanese).