The following books and web links may be helpful to the reader interested in a more information about Mars:
Magnificent Mars by Ken Croswell. Copyright 2003 (Free Press). An excellent source book, with photos, illustrations and information. I used this book extensively in researching the subject for my novel.
Postcards From Mars by Jim Bell. Copyright 2006 (Dutton). Fabulous pictures taken by the Spirit and Opportunity Mars rovers. The book gives you a good sense of the lay of the land on Mars.
The Planet Mars: A History of Observation and Discovery by William Sheehan. Copyright 1996 (UA Press). A great source of information concerning successive generations of discovery about Mars.
Mars as the Abode of Life by Percival Lowell. Copyright 1910 (Macmillan). Good book to get an understanding of how some astronomers were thinking a century ago. Lowell’s drawings of the canals on Mars are particularly interesting.
The Mars Project by Wernher von Braun. Copyright 1953 (Univ. of Illinois). This book presents the engineering challenges of an expedition to Mars as they appeared in the early days of space exploration.
Link to a diagram showing the Aldrin Cycler in action