Srimad Bhagavatam 1.9.43 - 49. Sūta Gosvāmī said: Thus Bhīṣmadeva merged himself in the Supersoul, Lord Śrī Kṛṣṇa, the Supreme Personality of Godhead,
Introduction To Bhagavad Gita
Thrill At Every Moment Part 3 - Krishna Temple Talk
The Spiritual Master
EXCELLENT QUESTIONS FOR EXCELLENT LIFE
Bindu 324
One has to perform devotional service in full tapasya, austerity. One should fast on the two Ekadasi days, which fall on the eleventh day of the waxing.
Bindu 330
Meditations on Maturity