Kanichai, C. (1981). R.G. Collingwood's philosophy of history. Pontifical Institute of Theology and Philosophy.
Lua i Stíl Chicago (17ú heag.)Kanichai, Cyriac. R.G. Collingwood's Philosophy of History. Alwaye, India: Pontifical Institute of Theology and Philosophy, 1981.
Lua MLA (8ú heag.)Kanichai, Cyriac. R.G. Collingwood's Philosophy of History. Pontifical Institute of Theology and Philosophy, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.