Spanish record". Geobios 51(3):211-217. doi:10.1016/j.geobios.2018.04.002. (PAYWALL), Testudines as parent. Edwin Cadena; Walter G. Joyce (2015). "A Review
D. J. (3 Haziran 2014). "The St. Louis Post-Dispatch Now Has A Partial Paywall. So Who's Buying?". St. Louis Magazine (İngilizce). 26 Mart 2016 tarihinde
Erişim tarihi: 5 Nisan 2022. ^ "Are Indian newspapers heading towards a paywall model?". Roy, Tasmayee Laha. 22 Mayıs 2020. ^ "Media & Entertainment Industry
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