APA (7th ed.) Citation

Whalen, T., & Filipova, F. (1999). Atlas Bulgaria: A tourist guide (3rd ed.). Datamap Europe.

Chicago Style (17th ed.) Citation

Whalen, Terry, and Filipina Filipova. Atlas Bulgaria: A Tourist Guide. 3rd ed. Sofia: Datamap Europe, 1999.

MLA (9th ed.) Citation

Whalen, Terry, and Filipina Filipova. Atlas Bulgaria: A Tourist Guide. 3rd ed. Datamap Europe, 1999.