Gale Group & Johnson, D. D. (2016). International directory of company histories. St. James Press, a part of Gale, Cengage Learning.
Chicago-viite (17. p.)Gale Group ja Drew D. Johnson. International Directory of Company Histories. Farmington Hills, Mich: St. James Press, a part of Gale, Cengage Learning, 2016.
MLA-viite (9. p.)Gale Group ja Drew D. Johnson. International Directory of Company Histories. St. James Press, a part of Gale, Cengage Learning, 2016.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.