The Mandukya Upanishad is not usually recommended for study to Western people. The book is too archaic for modern minds, for one thing, and a number of its arguments were written to refute the arguments of other Indian schools of thought existing at the time, some of which have now disappeared. Consequently these references are sometimes obsolete and often drearily uninteresting. However, for those few who are familiar with this kind of literature, its study is not difficult.
-- Notebooks Category 15: The Orient > Chapter 2: India > # 398