She also wrote the updated introduction to Sagan's book The Cosmic Connection, and the epilogue of Billions and Billions.

Enrique Dans did the same and among what he comments on in the epilogue that he wrote, the following [es] can be highlighted:

In addition, she wrote an introduction to The Cosmic Connection and the epilogue to Billions and Billions, both by Sagan.

Sarah Wilson's epilogue thoroughly outlines both the history of a friendship and, at the same time, the intellectual and artistic climate of the 1970s.

The Spanish-language edition includes additional texts of two ‘gurus' of the Hispanic Internet: José Luis Orihuela wrote the prologue, and Enrique Dans wrote the epilogue.

Translation, notes and afterword by Sebastian Veg.

K. Marx, Capital, Afterword to the second German edition.

In the afterword, Lacassin recalls the history of Quebec.

Translation, notes and afterword by Sebastian Veg.

Foreword by Rem Koolhaas, afterword by Daniel Birnbaum.

The Trojans: Extracts from the Memoirs (Chapter 59; Postface)

Preface by Jean Bernard, postface by Jacques Chirac.

Text by Anastassia Makridou-Bretonneau, preface by Catherine Elkar, postface by Julien Bézille.

The Postface concludes with a return to his private life.

Postface to the SOBEPS report about the Belgium UFO flap, by General De Brouwer.