Conversation so far:
When did Orson Scott Card start writing science fiction?
Orson Scott Card began writing science fiction in August 1977
What was the name of the story Analog published in August 1977 by Orson Scott Card?
While working at BYU Press, Orson Scott Card wrote short story Ender's Game. It was purchased by Ben Bova and published in an issue of Analog Science Fiction and Fact.

Question: So, Ender's Game was first published in Analog magazine--when did it become a book?
Self-contained rewrite: So, Ender's Game was first published in Analog magazine. when did it become a book?