APA (7th ed.) Citation

于永玉编著. 坚·坚韧顽强. 大众文艺出版社.

Chicago Style (17th ed.) Citation

于永玉编著. 坚·坚韧顽强. 大众文艺出版社.

MLA (8th ed.) Citation

于永玉编著. 坚·坚韧顽强. 大众文艺出版社.

Warning: These citations may not always be 100% accurate.