Willis R 1563 Or 4 : Mount Tabor. Or Private exercises of a penitent sinner : Serving for a daily practice of the life of faith, reduced to speciall heads comprehending the chiefe comforts and refreshings of true Christians: also certain occasionall observations and meditations profitably applyed. Written in the time of a voluntary retrait from secular affaires. By R.W. Esquire. Published in the yeare of his age 75. Anno Dom. 1639. The contents of the booke are prefixed.
Willis R C : An Essential Course In Modern Portuguese R C Willis
Willis Richard Hartley 1927 : Social exchange : advances in theory and research / edited by Kenneth J. Gergen and Martin S. Greenberg and Richard H. Willis.
Willis Robert : On the construction of the vaults of the middle ages.
Willis Robert 1800 1875 : The architectural history of the University of Cambridge and of the colleges of Cambridge and Eton / by Robert Willis ; edited with large additions and brought up to the present time by John Willis Clark.