易发久. (2011). 每天进步一点点: Progress a little every day. 凤凰出版社.
Chicago Style (17th ed.) Citation易发久. 每天进步一点点: Progress a Little Every Day. 凤凰出版社, 2011.
MLA (8th ed.) Citation易发久. 每天进步一点点: Progress a Little Every Day. 凤凰出版社, 2011.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.