Cita APA (7th ed.)

(AST), A. S. T. 503/257: Briefwisseling.

Cita Chicago (17th ed.)

(AST), Antwerpse Socialistische Turngouw. 503/257: Briefwisseling.

Cita MLA (8th ed.)

(AST), Antwerpse Socialistische Turngouw. 503/257: Briefwisseling.