APA (7th ed.) Citation

Jacobson, C. (2007). Picture Post. History Today, 57(6), 42.

Chicago Style (17th ed.) Citation

Jacobson, Colin. "Picture Post." History Today 57, no. 6 (2007): 42.

MLA (9th ed.) Citation

Jacobson, Colin. "Picture Post." History Today, vol. 57, no. 6, 2007, p. 42.