Franklin

MLA

Abeken, Heinrich Johann Wilhelm Rudolf, et al. Bismarck's Pen: the Life of Heinrich Abeken. London: G. Allen & company, ltd., 1911.

APA

Abeken, H. Johann Wilhelm Rudolf, Abeken, H. von Olfers, Barrett-Lennard, C. Edward, & Hoper, M. W. (1911). Bismarck's pen: the life of Heinrich Abeken. London: G. Allen & company, ltd.

Chicago

Abeken, Heinrich Johann Wilhelm Rudolf, Hedwig von Olfers Abeken, Charles Edward Barrett-Lennard, and M. W. Hoper. Bismarck's Pen: The Life of Heinrich Abeken. London: G. Allen & company, ltd., 1911.