A.C. Guyton: There are many physiology textbooks, in English and in many other languages, but the most outstanding one certainly has to be the one originally written by A.C. Guyton. First published in 1956, it has been upgraded in many later editions. Unfortunately,
Guyton has suddenly passed away in 2003 but his work has fortunately been continued by M.E. Hall and is now available in the 14th edition (2021): "Medical Physiology".