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.
Chicago Style aipamena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.
MLA aipamena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.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.