- $19.88Multiples by Robert SilverbergBetter World Books
- $6.18Roma Eterna by Robert SilverbergBetter World Books
- $7.53Star of Gypsies by Robert SilverbergBetter World Books
- $9.63The Masks of Time by Robert SilverbergBetter World Books
- $3.80Os Mundos Abertos de Robert Silverberg: Ficção Científica Curta em Língua Portuguesa (Selo Yhade) (Portuguese Edition)Amazon