Here are a few essential book recommendations:
Zen Mind, Beginners Mind - Shunryu Suzuki Roshi
Opening the Hand of Thought - Kosho Uchiyama Roshi
How To Cook Your Life - Kosho Uchiyama Roshi
The Posture of Meditation - Will Johnson
Realizing Genjokoan - Shohaku Okumura
Wake Up To Your Life - Ken McLeod
The Wholehearted Way
Nothing Special - Charlotte Joko Beck