ROBERT FREDERICK. (2005). SEVEN WONDERS OF THE WORLD. REALLY USEFUL MAP COMPANY LTD.
Citazione stile Chigago Style (17a edizione)ROBERT FREDERICK. SEVEN WONDERS OF THE WORLD. ENGLAND: REALLY USEFUL MAP COMPANY LTD, 2005.
Citatione MLA (9a ed.)ROBERT FREDERICK. SEVEN WONDERS OF THE WORLD. REALLY USEFUL MAP COMPANY LTD, 2005.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.