APA (7th ed.) Zitazioa
Villiard, P. Collecting Stamps: Everything you need to know to pursue the world's most popular hobby for fun, knowledge, and profit.
Chicago Style (17th ed.) Zitazioa
Villiard, Paul. Collecting Stamps: Everything You Need to Know to Pursue the World's Most Popular Hobby for Fun, Knowledge, and Profit.
MLA (9th ed.) Zitazioa
Villiard, Paul. Collecting Stamps: Everything You Need to Know to Pursue the World's Most Popular Hobby for Fun, Knowledge, and Profit.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.