张怡筠. (2007). 工作其实很简单: Manage your work easily. 河北教育出版社.
Chicago Style (17th ed.) Citation张怡筠. 工作其实很简单: Manage Your Work Easily. 河北教育出版社, 2007.
Cita MLA张怡筠. 工作其实很简单: Manage Your Work Easily. 河北教育出版社, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.