de Ricci, pp. 102-5 etc.; W. Y. Fletcher, English book collectors, pp. 336-41.
Richard Heber's books can often be recognised by his rectangular ink stamp 'BIBLIOTHECA HEBERIANA', added, according to Marc Vaulbert de Chantilly (lecture, 26/11/00), probably by Thomas Frognell Dibden, in only the more valuable books; or by the neat excision where it has been cut from the top right-hand corner of the first flyleaf.
He did not always use the ink stamp however, and he often made an acquisition note in characteristic small handwriting: