Double and Multiple stars are among the most fascinating astronomical objects. They range from 'optical binaries' that can be easily observed with a modest telescope, to distant and complex multiple systems that challenge even professional observers.
The first part of Jim Mullaney's book provides a comprehensive review of the different classes of double and multiple systems, along with a look at the astrophysics of these objects. This is followed by a detailed guide for amateur astronomers, describing how to observe them - using a variety of different techniques - and outlining how to record the observations.
In one book, here is all you need to observe double and multiple stars, and to understand the systems you are looking at.
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"...I can recommend Double and Multiple Stars and How to Observe Them to those who delight in seeing close points of light and those who can imagine the huge variety of suns they represent." -- Leif J. Robinson, in Sky & Telescope, October 2006