Cita APA (7a ed.)

Langer, W. L. (1950). European alliances and alignments, 1871-1890 (2nd ed. with suplementary bibliogr.). Alfred A. Knopf.

Cita Chicago Style (17a ed.)

Langer, William L. European Alliances and Alignments, 1871-1890. 2nd ed. with suplementary bibliogr. New York: Alfred A. Knopf, 1950.

Cita MLA (9a ed.)

Langer, William L. European Alliances and Alignments, 1871-1890. 2nd ed. with suplementary bibliogr. Alfred A. Knopf, 1950.