Cita APA

Lütgen, B., & Spicker, M. 1. (1970). 20 daily exercises. Melville, N.Y.: Belwin Mills.

Citación estilo Chicago

Lütgen, B., y Max 1858-1912 Spicker. 20 Daily Exercises. Melville, N.Y.: Belwin Mills, 1970.

Cita MLA

Lütgen, B., y Max 1858-1912 Spicker. 20 Daily Exercises. Melville, N.Y.: Belwin Mills, 1970.