In 2005 she wrote a book in Spanish reflecting that period: En casa de John Lennon (At John Lennon's House), Hercules Ediciones, ISBN 84-96314-18-9. The book contains photos of John, Yoko and Sean along with some postcards that John and Yoko sent to her, and anecdotes such as:
Rosaura explains that she taught Lennon to bake bread.
One day she unblocked the WC due to a marijuana bag.
Lennon burned a coffee maker because he forgot to fill it with water
That Yoko was very superstitious.
John gave Yoko carnations on her birthdays, the number of carnations corresponding to her age.
The couple slept on a bedstead supported on two church pews.
Rosaura spoke with Lennon's killer, Mark David Chapman, the day before his death in the Dakota entrance.
Rosaura arrived in Queens (New York) in 1962 with her husband Secundino and in 1970, she began work as a cleaner at the Dakota building. When Lennon arrived in 1973, her services were included as part of the rental package.