| https://planning.unc.edu/wp-content/uploads/sites/399/gravity_forms/5-81de9dce6655225287c2527d5d27d3d2/2025/06/SIX-Ways-to-Call_-How-Can-i-Talk-to-Human-at-Expedia%C2%AE%EF%B8%8F_-A-Step-by-Step-Guide.pdf |
| https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5319570 |
| https://planning.unc.edu/wp-content/uploads/sites/399/gravity_forms/5-81de9dce6655225287c2527d5d27d3d2/2025/06/Mexico-telefono-%C2%BFComo-llamar-a-Expedia-en-espanol.pdf |
| https://community.justlanded.com/en/World/forum/5-Ways-to-Contact-How |
