APA-referens (7:e uppl.)

Vogt, E. W. (2018). Spanish past-tense verbs up close (Second edition.). McGraw-Hill.

Chicago-referens (17:e uppl.)

Vogt, Eric W. Spanish Past-tense Verbs Up Close. Second edition. New York: McGraw-Hill, 2018.

MLA-referens (9:e uppl.)

Vogt, Eric W. Spanish Past-tense Verbs Up Close. Second edition. McGraw-Hill, 2018.