A new Trailblazer guidebook by Jamie McGuinness.
The only guidebook when I hiked up and above the north side of Everest Base Camp was Trekking in Tibet by Gary McCue. (In fact, I lost the guidebook while on that trek.)
Hiking Everest from the Tibet side has been getting increasingly problematic.
We recommend you hike the Nepal side, instead. Here’s the newest guidebook:
Amazon – Trekking in the Everest Region, 5th: includes Kathmandu City Guide