User blog comment:Bubby3/Psi function type I and II comparison./@comment-32467027-20170718085718/@comment-28606698-20170719170541

Year ago when I was beginning to study googology I used next sources in following order: (I was going along Bowser's numbers in order of their growth and was studying different notations using tables with approximations on the pages of the Bowser's numbers)
 * Large numbers
 * Knuth's up-arrow notation
 * Graham's number
 * Conway chained arrow notation
 * Jonathan Bowers, Bowers' googol series
 * Chris Bird, Chris Bird's Super Huge Numbers
 * Peter Hurford, Large Numbers, Part 3: Functions and Ordinals
 * Peter Hurford, Large Numbers, Part 4: Epsilon and Phi
 * Peter Hurford, Large Numbers, Part 5: SVO, LVO, and Beyond
 * David Metzler, Ridiculously huge numbers