(1973). Pratice and progress.
Trích dẫn kiểu ChicagoPratice and Progress. 1973.
MLA引文Pratice and Progress. 1973.
警告：這些引文格式不一定是100％准確.
APA引文
(1973). Pratice and progress.
Trích dẫn kiểu ChicagoPratice and Progress. 1973.
MLA引文Pratice and Progress. 1973.