APA (7th ed.) Citation

Isnard, R. (1921). Analysis of cardboard. Paper Trade Journal, 73, 40.

Chicago Style (17th ed.) Citation

Isnard, R. "Analysis of Cardboard." Paper Trade Journal 73 (1921): 40.

MLA (9th ed.) Citation

Isnard, R. "Analysis of Cardboard." Paper Trade Journal, vol. 73, 1921, p. 40.