Mullens, W H. (1917). A bibliography of British ornithology from the earliest times to the end of [...]: Including biographical accounts of the principal writers and bibliographies of their published works. London: Macmillan and Co.

A bibliography of British ornithology from the earliest times to the end of [...] : Including biographical accounts of the principal writers and bibliographies of their published works / William Herbert Mullens; H. Kirke Swann . — London : Macmillan and Co, 1917

Mullens, William Herbert. A Bibliography of British Ornithology From the Earliest Times to the End of [...]: Including Biographical Accounts of the Principal Writers and Bibliographies of Their Published Works.London: Macmillan and Co, 1917.