Cita APA (7th ed.)
Russel, H., & Truss, L. Envelopes: A Puzzling Journey Through The Royal Mail.
Cita Chicago (17th ed.)
Russel, Harriet, i Lynne Truss. Envelopes: A Puzzling Journey Through The Royal Mail.
Cita MLA (9th ed.)
Russel, Harriet, i Lynne Truss. Envelopes: A Puzzling Journey Through The Royal Mail.
Atenció: Aquestes cites poden no estar 100% correctes.