small book; short work
Refers to a book or written work of modest length. Often used in contrast with 大著 (たいちょ, 'large work').
See also: 大著
This small book is written for beginners.
my book; my humble work
Humble term used by an author to refer to their own book or written work. Common in prefaces, academic writing, and formal self-introductions.
In my humble book, I discussed this issue in detail.