APA (7th ed.) Citation

Sears, P. B. (1941). This useful world. Scott, Foresman r Comp.

Chicago Style (17th ed.) Citation

Sears, Paul B. This Useful World. Scott, Foresman r Comp, 1941.

MLA (8th ed.) Citation

Sears, Paul B. This Useful World. Scott, Foresman r Comp, 1941.

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