Cita APA (7a ed.)

Lovell, K., & Smith, C. H. J. (1975). Two grades arithmetic; book 1: With answers (rev. ed.). Ginn & Co.

Cita Chicago Style (17a ed.)

Lovell, K., y C. H. J. Smith. Two Grades Arithmetic; Book 1: With Answers. rev. ed. Bucks Londo: Ginn & Co, 1975.

Cita MLA (9a ed.)

Lovell, K., y C. H. J. Smith. Two Grades Arithmetic; Book 1: With Answers. rev. ed. Ginn & Co, 1975.