Consolmagno, Guy & Davis, Dan: Turn Left at Orion
The new edition of this excellent book, packed with viewing tips and clear instruction. Also realistic drawings of what you can expect to actually see.
Gribbin, John: In Search of the Big Bang
The best introduction to Big Bang. Very well written and explained. Recommended.
Kitchin, Chris: Photo-Guide to the Constellations
The photographs of the sky as it actually looks under a variety of conditions, coupled with a detailed guide to star-hopping and other useful techniques, will enable you to quickly and easily gain a working knowledge of the constellations.
Levy, David H.: Observing Variable Stars: A Guide for the Beginner
A good introduction to this fascinating branch of astronomy, where the amateur still makes a valuable contribution. Has good charts and seasonal observing suggestions.
Levy, David H.: Skywatching
An attractive and comprehensive introduction for the beginner, with charts by the lauded Wil Tirion. Suitable for about age 12 to adult.
Ridpath, Ian and Tirion, Wil: Collins Gem: Stars
This little "gem" is often overlooked by serious astronomers, but its small format (8cm x 11.5cm) gives you a star atlas in your shirt pocket! Separate chart for each constellation, down to mag 5. Lots of DSOs, including the Messiers, are marked.
Ridpath, Ian & Tirion, Wil: The Monthly Sky Guide
Clear and simple introduction for beginners of all ages.
Upgren, Arthur: Night Has a Thousand Eyes
This is, quite simply, the best introduction to naked eye astronomy yet written. Upgren weaves a remarkable book that takes the reader to a greater depth of understanding and knowledge than any other book aimed at a similar readership. The style is captivating and the explanations have a simplicity that comes from a mastery of the subject matter.