Colonel Draper's answer, to the Spanish arguments claiming the galeon, and refusing payment of the ransom bills, for preserving Manila from pillage and destruction - Draper, William (Printed for J. Dodsley, 1764)
Goldsmiths'-Kress no. 10053. - OCLC, 23829982. - Reproduction of original from Goldsmiths' Library, University of London. - Robertson, J. Bibl. of the Philippine Islands, p. 128