APA (7th ed.) Citation

Natanson, I. P. (1967). Theory of functions of a real variable (3rd print.). Frederick Ungar.

Chicago Style (17th ed.) Citation

Natanson, I. P. Theory of Functions of a Real Variable. 3rd print. New York: Frederick Ungar, 1967.

MLA (9th ed.) Citation

Natanson, I. P. Theory of Functions of a Real Variable. 3rd print. Frederick Ungar, 1967.