A prerequisite for professional translation is not only professional knowledge of a particular language, but also having relevant education in a given field, professional skills in the use of dictionaries and reference literature. This is the main difference between a philologist and a professional translator. For a professional translator, philology is a necessary but insufficient condition for success. Below are a number of essential dictionaries and encyclopedias that are an integral part of the translator’s work. The academic base of the Delta Translation Group, in the form of professional literature, is much wider, present on this page the literature whose digitization and electronic versions have been made available in recent years.