APA (7th ed.) Citation

Gutierres, G. (2006). What is a first countable space?

Chicago Style (17th ed.) Citation

Gutierres, Gonçalo. What Is a First Countable Space? 2006.

MLA (8th ed.) Citation

Gutierres, Gonçalo. What Is a First Countable Space? 2006.

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