APA (7th ed.) Citation

Eckstut, S. (1998). Focus on grammar. Basic level. Longman.

Chicago Style (17th ed.) Citation

Eckstut, Samuela. Focus on Grammar. Basic Level. San José, C.R.: Longman, 1998.

MLA (8th ed.) Citation

Eckstut, Samuela. Focus on Grammar. Basic Level. Longman, 1998.