if you can find a riggers handbook, it will tell you more about knots than you probably want to know.
Google search for 'Knot Tying' turned up about half a million sites dedicated to it. I should know more than I do... I'm often stumped when trying to tie something off or move something.
http://www.anwresidency.com/simulation/guide/resources/Knot_Tying_Manual.pdf http://www.herkommer.org/knots/FM5-125.pdf
I agree with the BSA book , it is very clear. Older the better, mine is from 1946. I took mountain climbing in the army and the teacher a one POP Sorenson said keep in mind , your going out over the ravine on your own knots , learn well.