What shape is a snowflake?

MLA

Stewart, Ian. What Shape Is a Snowflake?. Great Britain: Weidenfeld & Nicolson, 2001.

APA

Stewart, I. (2001). What shape is a snowflake?. Great Britain: Weidenfeld & Nicolson.

Chicago

Stewart, Ian What Shape Is a Snowflake?. Great Britain: Weidenfeld & Nicolson, 2001.