APA (7th ed.) Citation

(1991). Т. 6 (11-12). 1991.

Chicago Style (17th ed.) Citation

Т. 6 (11-12). 1991, 1991.

MLA (9th ed.) Citation

Т. 6 (11-12). 1991, 1991.

Warning: These citations may not always be 100% accurate.