The 19th century Tibetan Rimé teacher Jamgön Kongtrül recommended reading and practicing widely when you first encounter the dharma, then later limiting yourself to a few books and one or two practices and becoming intimate with them. Similarly, my teacher Ken McLeod advised on picking 10-12 books to carry with you on the Buddhist path and getting to know them incredibly well.
Following this advice, these are the books I consider to most important in my practice, both now and going forward.
Book of Serenity – Thomas Cleary (tr.)
Cultivating the Empty Field (Hongzhe) – Taigen Dan Leighton
How to Cook Your Life – Uchiyama Roshi
The Lotus Sutra
One Robe, One Bowl – Ryōkan
Opening the Hand of Thought – Uchiyama Roshi
Platform Sutra (Sutra of the Sixth Patriarch)
Shobogenzo (Treasury of the True Dharma Eye) – Eihei Dogen
Zen’s Chinese Heritage – Andy Ferguson
Zen Mind, Beginner’s Mind – Shunryu Suzuki Roshi
Zen Teachings of Homeless Kodo – Kosho Uchiyama & Shohaku Okumura