In addition to her fiction work, Cameron wrote two books of criticism and reflection on children's literature. The first, "The Green and Burning Tree", was released in 1969 and led an increased profile for Cameron in the world of children's literature. Throughout the 1970s, 1980s, and early 1990s Cameron worked as a traveling speaker and contributor to publications such as The Horn Book Magazine, Wilson Library Bulletin, and Children's Literature in Education. She was also a member of the founding editorial board for the children's magazine Cricket, which debuted in 1973. Her second book of essays, "The Seed and the Vision: On the Writing and Appreciation of Children's Books", came out in 1993. It is her final published book.