Tsvetkova, Milena. Book Science. Sofia: Enthusiast, 2018. 700 p. ISBN 978-619-164-267-0 Цветкова, Милена. Наука за книгата. София: Enthusiast, 2018. 700 с. ISBN 978-619-164-267-0 *UDC (Universal Decimal Classification)* 002.19 Books. Writings 028.02 Reading psychology 316.77 Sociology of communication 655 Printing. Publishing. Book Trade *DDC (Dewey Decimal Classification)* 002 The book 028 Reading & use of other information media 070 News media, journalism & publishing *LCC (Library of Congress Classification)* Z4-115.5 Books (General) Z1003-1003.5 Books and reading LB1049.9-1050.75 Reading (General) P87-96 Communication. Mass media *ГРНТИ = State Rubricator of Scientific and Technical Information* 19.51.45 Book science 19.51.41 Psychology of readers 15.81.49 Psychology of reading 19.21 Mass communications. Mass media