Tolong jelaskan mengenai Catatan dari Filsafat perenial

Ranjit Fernando (ed.) (1991), The Unanimous Tradition, Essays on the essential unity of all religions. Sri Lanka Institute of Traditional Studies, 1991

John Holman (2008), The Return of the Perennial Philosophy: The Supreme Vision of Western Esotericism. Watkins Publishing,

Perennial Philosophy, Brenda Jackson, Ronald L McDonald, Penguin Group (USA)

The other perennial philosophy: a metaphysical dialectic, Author	Alan M. Laibelman, University Press of America, (2000),

"The Mystery of the Two Natures", in Barry McDonald (ed.), Every Branch in Me: Essays on the Meaning of Man, Bloomington, Indiana: World Wisdom, 2002

Frithjof Schuon and the Perennial Philosophy, Authors Harry Oldmeadow and William Stoddart, Contributor	William Stoddart, Publisher World Wisdom, Inc, (2010)

Whitall N. Perry, A Treasury of Traditional Wisdom, Louisville, Kentucky: Fons Vitae, 2001