APA (7th ed.) Citation

Weaver, G. G., & Bollinger, E. W. (1949). Visual aids: Their construction and use. van Nostrand.

Chicago Style (17th ed.) Citation

Weaver, Gilbert G., and Elroy W. Bollinger. Visual Aids: Their Construction and Use. Toronto [u.a.]: van Nostrand, 1949.

MLA (9th ed.) Citation

Weaver, Gilbert G., and Elroy W. Bollinger. Visual Aids: Their Construction and Use. van Nostrand, 1949.