MLA

Cammaerts, Emile. Belgium From the Roman Invasion to the Present Day. London: Fisher Unwin, 1921.

APA

Cammaerts, E. (1921). Belgium from the Roman invasion to the present day. London: Fisher Unwin.

Chicago

Cammaerts, Emile, Belgium From the Roman Invasion to the Present Day. London: Fisher Unwin, 1921.