Cita APA (7a ed.)
Russel, H., & Truss, L. Envelopes: A Puzzling Journey Through The Royal Mail.
Cita Chicago Style (17a ed.)
Russel, Harriet, y Lynne Truss. Envelopes: A Puzzling Journey Through The Royal Mail.
Cita MLA (9a ed.)
Russel, Harriet, y Lynne Truss. Envelopes: A Puzzling Journey Through The Royal Mail.
警告：這些引文格式不一定是100％准確.