Simplify the following text for a Grade 13 native English-speaking person.
Original: She further elaborated on them in her magazines The Objectivist Newsletter , The Objectivist , and The Ayn Rand Letter , and in non-fiction books such as Introduction to Objectivist Epistemology and The Virtue of Selfishness .
Simplified: She talked about them more in The Objectivist Newsletter , The Objectivist , The Ayn Rand Letter , Introduction to Objectivist Epistemology and The Virtue of Selfishness .