Coles, J. H., & Walker, H. E. (1992). Postal cancellations of the Ottoman Empire (1. publ. 1984, repr. ed., incorporating 1987 suppl.). Christie's-Robson Lowe.
Chicago Style (17th ed.) CitationColes, John H., and Howard E. Walker. Postal Cancellations of the Ottoman Empire. 1. publ. 1984, repr. ed., incorporating 1987 suppl. London: Christie's-Robson Lowe, 1992.
MLA (9th ed.) CitationColes, John H., and Howard E. Walker. Postal Cancellations of the Ottoman Empire. 1. publ. 1984, repr. ed., incorporating 1987 suppl. Christie's-Robson Lowe, 1992.
Warning: These citations may not always be 100% accurate.