APA (7th ed.) Citation

Popov, N. E. (1998). Why? (1. paperback ed.). North-South Books.

Chicago Style (17th ed.) Citation

Popov, Nikolaj Evgenʹevič. Why? 1. paperback ed. New York [u.a.]: North-South Books, 1998.

MLA (9th ed.) Citation

Popov, Nikolaj Evgenʹevič. Why? 1. paperback ed. North-South Books, 1998.