Literature - A catalogue of books, journals and other sources of information
Polish Armorials - Bibliography.
Links and Bibliography for Heraldry - An annotated bibliography of heraldic references.
Library of Congress - Search here for Heraldry Titles.
Heraldry: A selected list of references - Library of Congress Publication.
Armorial Bibliography - Annotated bibliography of heraldic references.
Bibliography of Polish genealogy and heraldry - Surname Searchable.