Let's Go Guide - Switzerland & Interlaken
http://www.letsgo.com/102-western_europe-travel-guides-switzerland-d
http://www.letsgo.com/12408-western_europe-travel-guides-switzerland-switzerland_schweiz_suisse_svizzera-jungfrau_region-interlaken-c
Lonely Planet - Interlaken, Switzerland
http://www.lonelyplanet.com/switzerland/central-switzerland-and-berner-oberland/interlaken
Rick Steves'
http://www.ricksteves.com/plan/destinations/switz/gimbd.htm
http://www.ricksteves.com/plan/destinations/switz/mittaghorn.htm
Frommer's Guide
http://www.frommers.com/destinations/interlaken/
Maps