- R Askey, Review: Fourier Analysis and Approximation by Paul L Butzer and Rolf J Nessel,
*SIAM Review***14**(3) (1972), 507-508.

- J B, Review: Linear Operators and Approximation edited by P L Butzer and B Sz-Nagy,
*Mathematics of Computation***30**(133) (1976), 188.

- W Benz, Erinnerungen an frühe Jahre: Zum 70. Geburtstag von Paul Leo Butzer,
*Results Math.***34**(3-4) (1998), 209-213.

- H L L Busard, Review: Science in Western and Eastern Civilization in Carolingian Times by Paul Leo Butzer and Dietrich Lohrmann,
*Isis***86**(4) (1995), 629-630.

- P L Butzer, A retrospective on 60 years of approximation theory and associated fields,
*J. Approx. Theory***160**(1-2) (2009), 3-18.

- R J Nessel, Towards a survey of Paul Butzer's contributions to approximation theory, Mathematical analysis, wavelets, and signal processing, Cairo, 1994,
*Contemp. Math.***190**(1995), 31-65.

- P Nevai and A Ron, Dedication: 80th birthday of Paul L Butzer,
*J. Approx. Theory***160**(1-2) (2009), 1-2.

- E Görlich, A Krieg, R J Nessel and R L Stens, Paul L Butzer - Five years as Professor Emeritus,
*Results Math.***34**(1-2) (1998), 20-31.

- J R Higgins, An appreciation of Paul Butzer's work in signal theory,
*Results Math.***34**(1-2) (1998), 2-19.

- J R Higgins, Paul Butzer reaches his seventy-fifth year,
*Sampling Theory in Signal and Image Processing***2**(3) (2003), iii-v.

- V Kiryakova, On the occasion of Professor Paul L Butzer's 75th birthday,
*Fract. Calc. Appl. Anal.***6**(4) (2003), 333-340.

- Professor Paul L Butzer's 80th anniversary,
*Fract. Calc. Appl. Anal.***11**(3) (2008), 230-233.

- J R Rice, Review: Linear Operators and Approximation edited by P L Butzer, J P Kahane and B Sz-Nagy,
*Mathematics of Computation***28**(127) (1974), 859.

- J Rovnyak, Review: E B Christoffel: The Influence of His Work on Mathematics and the Physical Sciences edited by P L Butzer and F Fehér,
*Science, New Series***217**(4555) (1982), 145.

- E Scholz, Review: E B Christoffel: The Influence of His Work on Mathematics and the Physical Sciences edited by P L Butzer and F Fehér,
*Isis***74**(2) (1983), 270-271.

- C Vinti, A survey on recent results of the Mathematical Seminar in Perugia, inspired by the work of Professor P L Butzer,
*Results Math.***34**(1-2) (1998), 32-55.

- O Widlund, Review: Linear Operators and Approximation edited by P L Butzer and B Sz-Nagy,
*Mathematics of Computation***26**(117) (1972), 290-292.