APA

Langer W. L., Schorske C. E. & Schorske E. (1969). Explorations in crisis: papers on international history. Cambridge: Belknap Press of Harvard University Press.

Chicago

Langer William L, Schorske Carl E and Schorske Elizabeth. 1969. Explorations in crisis: papers on international history. Cambridge: Belknap Press of Harvard University Press.

Harvard

Langer W. L., Schorske C. E. and Schorske E. (1969). Explorations in crisis: papers on international history. Cambridge: Belknap Press of Harvard University Press.

MLA

Langer William L, Schorske Carl E and Schorske Elizabeth. Explorations in crisis: papers on international history. Cambridge: Belknap Press of Harvard University Press. 1969.