Cita APA (7th ed.)

Humprey, D. d. I. d. (1975). Singer: Why do you sing. [s.n.].

Cita Chicago (17th ed.)

Humprey, Dolores de Iruretagoyena de. Singer: Why Do You Sing. Manila: [s.n.], 1975.

Cita MLA (9th ed.)

Humprey, Dolores de Iruretagoyena de. Singer: Why Do You Sing. [s.n.], 1975.