According to the credits, all photos come from the Getty Agency.
The only problem is that the woman in the photo is NOT Marianne. I recall that this is not the first time we see this photo printed in a book with wrong names.
I showed the photo to Marianne, and she wrote:
No this is not me. It is photo by Jim Burke (Life Magazine) who came to Hydra in 1960. We all climbed the mountain visiting the monastery and she was in the gang. I don't remember her name, she was just visiting the island as far as I remember.
I sent a note to the Publisher (Flame Tree Publisher).