Fear as Fuel (The Motivation Code)

Isa V1: A Novel (1887)

Is The Pope To Rule America? With Ten Addresses On What Protestants Stand For (1913)

Is The Higher Criticism Scholarly? Clearly Attested Facts Showing That The Destructive Assured Results Of Modern Scholarship Are Indefensible (1922)

Is She His Wife? Or Something Singular: A Comic Burletta, In One Act (1877)

Is Roman Catholicism In American Identical With That Of The Popes? Or Open Letters To Cardinal James Gibbons (1914)

Is It Utopian? A Plea For The Evangelization Of The Masses By Voluntary Lay Help (1880)

Is Christianity True? Answers From History, The Monuments, The Bible, Nature, Experience, And Growth Of Christianity (1897)

Irving's Sketch Book (1911)