易发久. (2011). 每天进步一点点: Progress a little every day. 凤凰出版社.
Citación estilo Chicago易发久. 每天进步一点点: Progress a Little Every Day. 凤凰出版社, 2011.
Cita MLA易发久. 每天进步一点点: Progress a Little Every Day. 凤凰出版社, 2011.
警告：这些引文格式不一定是100％准确.
Cita APA