霍伊尔. (2008). 离太阳只有七步: Seven steps to the sun. 重庆出版社.
Chicago Style aipamena霍伊尔. 离太阳只有七步: Seven Steps to the Sun. 重庆出版社, 2008.
MLA aipamena霍伊尔. 离太阳只有七步: Seven Steps to the Sun. 重庆出版社, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
APA aipamena