Bill Aitken, The Nanda Devi Affair — by a Scottish-Indian writer who lived in the Garhwal hills for decades. Not specifically about Kedarnath but the best portrait in English of the western Himalayan landscape and its religious geography.
Ruskin Bond, The Roads to Mussoorie — gentle essays and stories by Garhwal's most beloved writer-in-residence. Bond never visited Kedarnath himself but conveys the texture of the surrounding hill country better than any guidebook.
Stephen Alter, Sacred Waters: A Pilgrimage Up the Ganges River to the Source — a perceptive account of one season on the Char Dham circuit, written by an American who grew up in Mussoorie. Includes a full section on the Kedarnath pilgrimage.
Wilfrid Noyce, Climbing the Fish's Tail — older but still readable account of climbing in the Garhwal Himalaya in the 1950s, with good descriptions of the approach valleys.
Hugh Thomson, Nanda Devi: A Journey to the Last Sanctuary — an attempted modern pilgrimage to one of the great closed-off mountains of the region. Conveys the politics and the spiritual weight of the western Himalayas.