Triangular Triples from Ceilings to Floors. - Tom Jenkyns; Eric Muller (Am. Math. Mon., 2000)

Fundamentals of Discrete Math for Computer Science - A Problem-Solving Primer. - Tom Jenkyns; Ben Stephenson (Springer, 2013)

Fundamentals of Discrete Math for Computer Science - A Problem-Solving Primer, Second Edition - Tom Jenkyns; Ben Stephenson (Springer, 2018)