Česká pošta vydala první známku na téma postcrossing [online]. Deník.cz, 2015-09-08. Dostupné online.
facebook.com
Did you notice we reached 33 million received postcards yesterday? Hurray! Here's the lucky Dutch card, registered in Japan! [online]. Facebook, 2015-12-06. Dostupné online.
e reached 34 million postcards yesterday, with this pretty card which traveled from Finland to Germany! [online]. Facebook, 2016-02-04. Dostupné online.
Woohoo! We juuuust hit 36 million postcards! That’s a lot of postcards! [online]. Facebook, 2016-05-31. Dostupné online.
mpo.cz
Postcrossing [online]. Praha: Ministerstvo průmyslu a obchodu, 2015-09-02 [cit. 2020-10-03]. Dostupné online.
postcrossing.com
postcrossing.com
Postcrossing History [online]. Postcrossing.com, 2005-07-14. Dostupné online. (anglicky)
Here's the lucky postcard ... [online]. 2014-03-29. Dostupné online.
Here it is, lucky postcard number 24 million, which traveled 8,084 km from Latvia to Japan in 8 days! [online]. 2014-05-31. Dostupné online.
Hurray! We just reached 28 million exchanged postcards! Check out postcard # 28,000,000… [online]. 2015-02-05. Dostupné online.
Yesterday we reached 29! MILLION! POSTCARDS! Hurray! Only 1 million left for the big 30! :) [online]. 2015-04-03. Dostupné online.
YAY, another million cards registered! :)
Here's postcard number 31,000,000, sent from Netherlands to Philippines… [online]. 2015-08-05. Dostupné online.
web.archive.org
FAXON, Hilary. Interview: Paulo Magalhães, Founder of Postcrossing.com [online]. shanghaiist.com, 2008-07-17. Dostupné v archivu pořízeném dne 2012-02-17. (anglicky)
webcitation.org
Countries in Postcrossing [online]. Postcrossing [cit. 2016-07-24]. Dostupné v archivu pořízeném dne 2016-05-28. (anglicky)