They should seek a publisher who has published work which has something in common with their own. This Directory can be very useful in that regard. They should ask what aspects of the publisher's role are most important at this particular point in their development as a writer. A good match between poet and publisher is essential. It is useful for poets to read widely about the book publishing industry.
Reference materials are available in a variety of publications both in bookstores and libraries.
Literary organizations such as Poets House, Poets and Writers and the Council for Literary Presses can also help. As in any field, writers benefit from gaining as much knowledge as possible as they seek to bring their work into print. Book publication is part of a process of getting poems to their potential audience. The process is complemented by readings and the development of reciprocal relationships with new audiences. This is more than marketing.