易发久. (2011). 每天进步一点点: Progress a little every day. 凤凰出版社.
Cita Chicago Style (17a ed.)易发久. 每天进步一点点: Progress a Little Every Day. 凤凰出版社, 2011.
Cita MLA (8a ed.)易发久. 每天进步一点点: Progress a Little Every Day. 凤凰出版社, 2011.
Precaución: Estas citas no son 100% exactas.