The following article by Rev. Fujita Issho published in Insight Journal
is very helpful in describing zazen:
Zazen Is Not the Same as Meditation (buddhistinquiry.org)
Dainin Katagiri. The Light That Shines Through Infinity, edited by Andrea Martin. Shambhala Press, Boulder 2017.
Shundo Aoyama. Zen Seeds: Reflections of a Female Priest, Translated by Patricia Dai-En Bennage. Kosei Publishing, Tokyo 1990.
Shunryu Suzuki. Branching Streams Flow in the Darkness: Zen Talks on the Sandokai, edited by Mel Weitzman and Michael Wenger. Univ. of California Press 1999.
Barbara O'Brien. The Circle of the Way: A Concise History of Zen, Shambhala Press, Boulder 2019.
Shunryu Suzuki. Zen Mind, Beginner’s Mind: Informal talks on Zen meditation and practice, edited by Trudy Dixon, Weatherhill, New York, Tokyo 1970.
Dainin Katagiri. You have to say something: manifesting Zen insight, edited by Steve Hagen. Shambhala Press, Boston 1998.
Kosho Uchiyama and Shohaku Okumura. The Zen Teaching of Homeless Kodo, edited by Molly Delight Whitehead. Wisdom Publications, Boston 2014.
Norman Fischer. The World Could Be Otherwise: Imagination and the Bodhisattva Path, Shambhala Press, Boulder 2019.
Kosho Uchiyama. Opening the Hand of Thought: Foundations of Zen Buddhist Practice, translated and edited by Tom Wright, Jisho Warner, and Shohaku Okumura. Wisdom Publications, Boston 2004.
Kosho Uchiyama. How to Cook Your Life: From the Zen Kitchen to Enlightenment. Dogen’s classic Instructions for the Zen Cook. Shambhala, Boston and London 2005.
Dainin Katagiri. Returning to Silence: Zen Practice in Daily Life, edited by Yuko Conniff and Willa Hathaway. Shambhala, Boston and London 1988.
Charlotte Joko Beck. Nothing Special: Living Zen, edited by Steve Smith. Harper, San Francisco 1993.
Shunryu Suzuki. Not Always So: practicing the true spirit of Zen, edited by Edward Espe Brown. Quill Publishing 2002.
Jakusho Kwong. No Beginning, No End: The Intimate Heart of Zen, edited by Peter Levin. Shambhala Publications, Boulder 2010.
Jikyo Cheryl Wolfer, editor. The Eightfold Path, Temple Ground Press, Olympia 2016.
Kosho Uchiyama. Deepest Practice, Deepest Wisdom: Three Fascicles form Shobogenzo with Commentaries, translated by Daitsu Tom Wright and Shohaku Okumura. Wisdom Publications 2018.
Zen Teachings in Challenging Times, Introduction by Patricia Dai-En Bennage. Temple Ground Press, Olympia 2018.
Shohaku Okumura. Living by Vow: A Practical Introduction to Eight Essential Zen Chants and Texts, edited by Dave Ellison. Wisdom Publications, Boston 2012.
Taigen Dan Leighton. Zen Questions: Zazen, Dogen, and the Spirit of Creative Inquiry, Wisdom Publications, Boston 2011.
Shohaku Okumura. Realizing Genjokoan: The Key to Dogen’s Shobogenzo. Wisdom Publications, Boston 2010.
Jikyo Cheryl Wolfer, ed. Seeds of Virtue, Seeds of Change: A Collection of Zen Teachings. Temple Ground Press, Olympia 2014.
Steve Hagen. Buddhism Plain & Simple: The Practice of Being Aware, Right Now, Every Day. Broadway Books, New York 1997.
Charlotte Joko Beck. Everyday Zen: Love & Work, edited by Steve Smith. Harper San Francisco, 1989.