Walker's Haute Route: Chamonix to Zermatt: Real SwissTopo/IGN Maps 1:25,000/1:50,000 - no need to carry separate maps (The Great Treks of the Alps): McCluggage, Andrew: 9781912933020: Amazon.com: Books
The Walker's Haute Route | Zermatt
How Hard is the Walker's Haute Route? | Pygmy Elephant
The Walker's Haute Route: A guide to the trek, by Alpine Exploratory