Cita APA (7a ed.)

Boswell, P. (1949). The Middle silurian rocks of North Wales (1st. ed.). Edward Arnold.

Cita Chicago Style (17a ed.)

Boswell, P.G.H. The Middle Silurian Rocks of North Wales. 1st. ed. London: Edward Arnold, 1949.

Cita MLA (9a ed.)

Boswell, P.G.H. The Middle Silurian Rocks of North Wales. 1st. ed. Edward Arnold, 1949.