On the spread of influenza by contagion.

MLA

Sisley, Richard and Royal College of Physicians of London. On the spread of influenza by contagion. [Place of publication not identified] : [publisher not identified], 1891.

APA

Sisley, R. & Royal College of Physicians of London. (1891). On the spread of influenza by contagion. [Place of publication not identified] : [publisher not identified].

Chicago

Sisley, Richard and Royal College of Physicians of London. On the spread of influenza by contagion. [Place of publication not identified] : [publisher not identified], 1891.