Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_42 ( isbn VARCHAR, first_edition VARCHAR )

### Question ###
What is the ISBN of the book with a first edition in May 2011?

### Accurate SQL ###

SELECT isbn FROM table_name_42 WHERE first_edition = "may 2011"