Sigg, O. (1997). Political Switzerland. Zurich, Switzerland: Pro Helvetia.
Trích dẫn kiểu ChicagoSigg, Oswald. Political Switzerland. Zurich, Switzerland: Pro Helvetia, 1997.
MLA引文Sigg, Oswald. Political Switzerland. Zurich, Switzerland: Pro Helvetia, 1997.
警告:這些引文格式不一定是100%准確.