于阳. (2008). 给幸福留一扇门: Leave a door open for happiness. 陕西师范大学出版社.
Dyfyniad Arddull Chicago于阳. 给幸福留一扇门: Leave a Door Open for Happiness. 陕西师范大学出版社, 2008.
Dyfyniad MLA于阳. 给幸福留一扇门: Leave a Door Open for Happiness. 陕西师范大学出版社, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.