Since a recent project was the Komi Cap I decided to write about some books containing information about the Komi tradition, people and patterns.
My absolute favourites are two books by Galina Nikolaevna Klimova: "Uzorne Viazane Komi" (Knitted Patterns of the Komi) 1978, and "Tekstil´nyi ornament Komi" (Komi Textile Ornamentation) 1984.
They are in Russian, which means that most of the information in the text is lost to me, but they contain a lot of charts that make up for that. Very hard to find copies of these books.
In the book "Finno-Ugric Folk Art", 1977, by Istvàn Rász there is interesting information regarding many Finno-Ugric people, no knitting patterns though.
If you want to know more about the Komi religion, mythology, traditions and rites you should read "Encyclopaedia of Uralic Mythologies - Komi Mythology". The English edition is based on the Russian original from 1999 (Russian Academy of Sciences, Uralic Department, Komi Scientific Center Institute of Language, Literature and History, Ministry of Culture and Higher Education of the Republic of Komi).
And then Charlene Schurch: "Mostly Mittens, Traditional Knitting Patterns from Russia´s Komi People". This book has also been called "Knitting Marvelous Mittens, Ethnic Designs from Russia" and "Mostly Mittens. Ethnic Knitting Designs from Russia, Revised Edition" in later editions. There are lots and lots of nice patterns here.