Where Can I Get Instructions On How To Build A Contemporary Looking Rolling Library Ladder?

There are quiet a few books which show simple ways on how to built things, you can refer to the book "How Things Work" to obtain detailed information how to create a rolling library ladder.   

A ladder basically is an erect set of steps, there are two kinds of ladders they are rigid ladders and rope ladders. Rigid ladders can be leaned against any sort of vertical surface like a wall, where as a rope ladder can be hung from top. The steps of a ladder are known as rungs, and the vertical components of a rigid ladder are known as stiles. With little agility, a person can slide down the stiles without even climbing down each rung.

Rigid ladders are available indifferent forms and are mostly made out of wood.