APA (7th ed.) Citation

Natanson, I. P., Boron, L. F., & Hewitt, E. Theory of functions of a real variable. Frederick Ungar Publishing Co.

Chicago Style (17th ed.) Citation

Natanson, I. P., Leo F. Boron, and Edwin Hewitt. Theory of Functions of a Real Variable. New York: Frederick Ungar Publishing Co.

MLA (8th ed.) Citation

Natanson, I. P., et al. Theory of Functions of a Real Variable. Frederick Ungar Publishing Co.