Cita APA (7a ed.)

(1970). Intensive course in English: Advanced 1. English Language Services, Inc.

Cita Chicago Style (17a ed.)

Intensive Course in English: Advanced 1. Washington, DC: English Language Services, Inc, 1970.

Cita MLA (9a ed.)

Intensive Course in English: Advanced 1. English Language Services, Inc, 1970.