Nisargadatta MaharajBehold, the real experiencer is not the mind, but myself, the light in which everything appears. Self is the common factor at the root of all experience, the awareness in which everything happens.

Nisargadatta Maharaj

Advāita Makaranda
Nectar of Non-Duality, by Lakshmidhara Kavi

Reference Materials:

Video/Audio Lectures

Swami Paramarthananda
7 classes (~90 mins each)

Swami Dayananda Saraswati
33 classes (variable lengths)

Advaita Makaranda - Class #1 - 1984 Spiritual Camp - Swami Dayananda

Swamini Satyavratananda
12 classes (~55 mins each)

Swami Viditatmananda
10 classes (search for "Advaita Makaranda" on the linked page)

Swami Tattvavidananda
7 classes (search for "Advaita_Makaranda" on the linked page)