APA (7th ed.) Citation

Thornton, P. M. (1881). Foreign secretaries of the XIX century / by P.M. Thornton (2nd ed.). Allen.

Chicago Style (17th ed.) Citation

Thornton, P. M. Foreign Secretaries of the XIX Century / by P.M. Thornton. 2nd ed. Allen, 1881.

MLA (9th ed.) Citation

Thornton, P. M. Foreign Secretaries of the XIX Century / by P.M. Thornton. 2nd ed. Allen, 1881.

Warning: These citations may not always be 100% accurate.