https://www.experts-exchange.com/questions/29290726/57-Ways-to-Contact-How-can-i-speak-to-someone-at-EXPEDIA-Full-Guide-Step-By-Step.html

https://www.workingus.com/forums/topic/ten-ways-to-contact-how-reach-to-talk-at-american-airlines%ef%b8%8f-complete-guide/

https://ctl.gatech.edu/sites/default/files/webform/teaching_with_technology_partner/_sid_/14-ways-to-approach-priceline-customer-service-by-phone-number-chat-and-email-options.pdf

https://ctl.gatech.edu/sites/default/files/webform/teaching_with_technology_partner/_sid_/13-ways-to-dial-priceline-customer-service-by-phone-number-chat-and-email-options.pdf

(Coinbase help Center) How do I contact Coinbase customer care?

https://www.workingus.com/forums/topic/ten-ways-to-contact-how-reach-to-talk-at-delta-airlines%ef%b8%8f-complete-guide/

service

https://ctl.gatech.edu/sites/default/files/webform/teaching_with_technology_partner/_sid_/13-ways-to-communicate-with-priceline-customer-service-by-phone-number-chat-and-email-options.pdf

https://deltaairlinesespaoltelfono.zohodesk.com/portal/en/kb/articles/copa-telefono-c%C3%B3mo-llamar-a-copa-airlines-desde-m%C3%A9xico

https://deltaairlinesespaoltelfono.zohodesk.com/portal/en/kb/articles/copa-telefono-c%C3%B3mo-llamar-a-copa-airlines-desde-m%C3%A9xico