Speaking Tree

http://timesofindia.speakingtree.in/search/all/Bhishma

Sacred Text

http://www.sacred-texts.com/hin/dutt/maha08.htm

Three Princesses

http://www.kidsgen.com/fables_and_fairytales/indian_mythology_stories/the_three_princesses.htm
https://www.youtube.com/results?search_query=Bhishma+Amba+Ambika+and+Ambalika

Gayatri

The venerable Bhisma, while extolling the greatness of the Gayatri from his bed of arrows declares; “Where the Gayatri is chanted, untimely deaths involving the performance of obsequies for children by their elders will not occur”. Thus it is a prayer for universal welfare which the initiated must perform as a sacred trust enjoined upon him.

http://mantracollection.blogspot.com/2012/04/24-gayatris-photos-science-origin-audio.html

Agastya

In the Mahabharata Anushasanaparva Chapter 155, the following is recounted by

Bhishma to Arjuna. Bhishma himself was told this by Vayu,

while extolling Agastya. Once the devas, after being humiliated in battle by the asuras, came to Agstya for help. Agastya promptly started burning the asuras with his tapas energy, and many of them fell to the earth and the netherworld. He let them live, but devaloka was finally rid of Asuras.

http://blessedpair.blogspot.com

Gen Next

http://hindumythologyforgennext.blogspot.in/search/label/The%20Mahabharatha

His Power

When approached by Duryodhana to become the Commander in Chief of the Kaurava army - Bhisma
reveals his  Power

With the power of my weapons,I can, in a trice, destroy this universe consisting of

1. Gods, 
2. Asuras,
3. Rakshasas, and
4. Human beings.