The Physical Principles of the Quantum Theory (German: Physikalischen Prinzipien der Quantentheorie publisher: S. Hirzel Verlag, 1930) by Nobel laureate (1932) Werner Heisenberg and subsequently translated by Carl Eckart and Frank C. Hoyt.

Then in 1949, according to its copyright page, Dover Publications reprinted the "unabridged and unaltered" 1930's version.

[1] The book discusses quantum mechanics and one 1931 review states that this is a "less technical and less involved account of the theor[y]".

1901 - d. 1976) was a renowned German theoretical physicist whose work pioneered and advanced quantum mechanics.

He was awarded the 1932 Nobel Prize in Physics "for the creation of quantum mechanics, the application of which has led to the discovery of the allotropic forms of hydrogen".