(1928). The history of Nations: Norway, Sweden and Denmark. P. F. Collier & Son Co..
Čikaški stil citiranja (17. izdanje)The History of Nations: Norway, Sweden and Denmark. New York: P. F. Collier & Son Co., 1928.
MLA način citiranja (9. izdanje)The History of Nations: Norway, Sweden and Denmark. P. F. Collier & Son Co., 1928.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.