Dwarven materials:
Norse legends: Thor's hammer and many other magic items of the Aesir were built by the dwarves, etc.
Snow White and the Seven Dwarves
Tolkien: The Hobbit, The Lord of the Rings
Gaming: D&D Dwarves are based on Tolkien and the Norse legends.
For gaming, I prefer the older 2e materials. The 3e/3.5e dwarven materials have been highly focused on rules (crunch) and less on background (flavor).
The DMG has the Dwarven Defender prestige class.
The Faiths & Pantheons book (FR) has the Dwarven Pantheon for both Greyhawk and Forgotten Realms.
The new FR Players Handbook has the Hammer of Moradin prestige class.
There are other dwarven prestige classes in other materials, but the Dwarven Defender and the Hammer of Moradin are the two "classic" elite dwarven archtypes. The upcoming racial book from WOTC should be interesting.
There are all kinds of online resources for dwarves; use a search engine. The greyhawk sites has useful stuff about dwarves in greyhawk. Various sites have info about forgotten realms dwarves.
Warhammer has some great stuff on dwarves too.
your father is said:
Thanks to everyone who responded, that's lots to go on. I'll see what I can find