* {{cite book | last=Madison | first=Charles Allan | title=Irving to Irving: Author-publisher Relations, 1800-1974 | publisher=New York : R. R. Bowker Company | publication-place=New York | date=1974 | isbn=0-8352-0772-2}}
<ref name="p572">{{cite book | last=Madison | first=Charles Allan | title=Irving to Irving: Author-publisher Relations, 1800-1974 | publisher=New York : R. R. Bowker Company | publication-place=New York | date=1974 | isbn=0-8352-0772-2 | page=}}</ref>