Reddit reviews Dewdrops on a Lotus Leaf: Zen Poems of Ryokan

Ryokan was a poet, he has a book.

https://www.amazon.com/Dewdrops-Lotus-Leaf-Poems-Ryokan/dp/1590301080

But something you can just jump into can be found here.

http://thezenuniverse.org/anecdotes-poetry-zen-master-ryokan/

I think Asian poetry should be your go to for this.
Chinese:
[Hanshan] (https://www.amazon.com/Collected-Mountain-Mandarin-Chinese-English/dp/1556591403/ref=sr_1_1?ie=UTF8&qid=1481519439&sr=8-1&keywords=hanshan)
[Libai and Dufu] (https://www.amazon.com/Li-Po-Tu-Translated-Introduction/dp/0140442723/ref=sr_1_3?ie=UTF8&qid=1481519506&sr=8-3&keywords=li+po)
[Tao Yuanming] (https://www.amazon.com/Selected-Poems-Tao-Chien/dp/1556590563/ref=sr_1_1?ie=UTF8&qid=1481519544&sr=8-1&keywords=Tao+qian)
and Japanese:
[Saigyo] (https://www.amazon.com/Saigyo/dp/023107493X/ref=sr_1_1?ie=UTF8&qid=1481519595&sr=8-1&keywords=Saigyo)
[Basho] (https://www.amazon.com/Narrow-Road-Interior-Writings-Shambhala/dp/1570627169/ref=sr_1_3?ie=UTF8&qid=1481519621&sr=8-3&keywords=Basho)
[Ryokan] (https://www.amazon.com/Dewdrops-Lotus-Leaf-Poems-Ryokan/dp/1590301080/ref=sr_1_4?ie=UTF8&qid=1481519642&sr=8-4&keywords=Ryokan)