APA引文

Erkama, T. (1973). Group actions and extension problems for maps of balls. Suomalainen Tiedeakatemia.

Chicago Style (17th ed.) Citation

Erkama, Timo. Group Actions and Extension Problems for Maps of Balls. Helsinki: Suomalainen Tiedeakatemia, 1973.

MLA引文

Erkama, Timo. Group Actions and Extension Problems for Maps of Balls. Suomalainen Tiedeakatemia, 1973.

警告：这些引文格式不一定是100％准确.