I mostly draw on loose leaf or sketchbooks I made myself out of either Bond printer paper (high grade, 90gr+), Opaline, Kraft paper (Very rough brown paper bag), or cream Reprograf (my favorite of the bunch, cane sugar mulch paper, looks like recycled paper but not quite, very high quality and nice texture specially for drawing). I use all sorts of pens (ballpoints, gel ink, or cheaper fountain pens) and mostly 2mm and 0.5 pencils, color or graphite leads depending on my mood.

As for books, I keep a few on hand but mostly Lauricella's MORPHO series, Keys to Drawing by Bert Dodson, Drawing Form and Pose by TomFoxDraws, Bridgman and Hogarth stuff, the Lezhin TACO books, and a bunch of art pieces from artists I like I can copy on a whim to mix things up, also Posemaniacs . com when I feel like grinding.