The orchid hybrids
MLA
Hansen, George. The Orchid Hybrids. London: Dulau & co.; [etc., etc.], 1895.
APA
Hansen, G. (1895). The orchid hybrids. London: Dulau & co.; [etc., etc.].
Chicago
Hansen, George, The Orchid Hybrids. London: Dulau & co.; [etc., etc.], 1895.