APA-viite (7. p.)

Guillén, M. F. (2023). The perennials: The megatrends creating a postgenerational society. St. Martin's Press.

Chicago-viite (17. p.)

Guillén, Mauro F. The Perennials: The Megatrends Creating a Postgenerational Society. New York: St. Martin's Press, 2023.

MLA-viite (9. p.)

Guillén, Mauro F. The Perennials: The Megatrends Creating a Postgenerational Society. St. Martin's Press, 2023.