If the year of the primary source is known (in this case Hubbard, 1998), cite as follows
(Hubbard, 1998, as cited in Stanley, 2014)
If the year of the primary source is unknown, cite as follows
Hubbard's work (as cited in Stanley, 2014)
On the reference list, only add the author whose work you have personally read, e.g. Stanley in this example.