Landau E. Elementary number theory

New York, Chulsea Publishing Company, 1958. - 256 pages.Professor Landau gave a six-semester course on Number
Theory at the University of Gottingen, which was published in three volumes
as Vorlesungen uber Zahlentheorie (Leipzig, 1927).
When Vorlesungen uber Zahlentheorie was reprinted in 1947, the part
on Elementary Number Theory was issued separately as Elementare
Zahlentheorie, with a German-English vocabulary. This made the book somewhat
more accessible to students; but it was hoped that the book would ultimately
become available in English, and this hope is now realized.