Holroyd, J. E. (1967). Seventeen steps to 221B: A collection of Sherlockian pieces by English writers. Allen & Unwin.
Cita Chicago (17th ed.)Holroyd, James Edward. Seventeen Steps to 221B: A Collection of Sherlockian Pieces by English Writers. London: Allen & Unwin, 1967.
Cita MLA (8th ed.)Holroyd, James Edward. Seventeen Steps to 221B: A Collection of Sherlockian Pieces by English Writers. Allen & Unwin, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.