灵犀工作室. (2009). 青少年最感兴趣的世界之奇: World chief wonders for youngsters. 青岛出版社.
Dyfyniad Arddull Chicago灵犀工作室. 青少年最感兴趣的世界之奇: World Chief Wonders for Youngsters. 青岛出版社, 2009.
Dyfyniad MLA灵犀工作室. 青少年最感兴趣的世界之奇: World Chief Wonders for Youngsters. 青岛出版社, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.