1. Abakumov, S. I. (1950). Methods of teaching punctuation. 2nd ed. Moscow: Publishing House of the APN RSFSR. 116 p. (In Russ.).
2. Arkhangelskaya, Yu. V., Pavlova, E. S. (2005). What is a “common element” in compound sentences and what should be done with a comma? Russian speech, 4: 60—63. (In Russ.).
3. Blinov, G. I. (1990). Methods of studying punctuation at school. 2nd ed. Moscow: Prosveshchenie. 208 p. ISBN 5-09-001105-2. (In Russ.).
4. Dormashev, Yu. B. (1995). Psychology of attention. Moscow: Trivola. 347 p. ISBN 5-88415- 018-0. (In Russ.).
5. Galperin, P. Ya. (2001). To the problem of attention. In: Psychology of attention: A textbook. Moscow: Chero. 534—542. ISBN 5-88711-149-6. (In Russ.).