APA (7th ed.) Zitazioa

Gustavson, C. G. (1955). A preface to history. McGraw-Hill.

Chicago Style (17th ed.) Zitazioa

Gustavson, Carl G. A Preface to History. Nueva York: McGraw-Hill, 1955.

MLA (9th ed.) Zitazioa

Gustavson, Carl G. A Preface to History. McGraw-Hill, 1955.