If the pages are not on consecutive pages, add each page number separating with a comma.

http://people.instructure.com/eportfolios/109928/Dressage_Intro_Test_C_Evening_2020_Results__Magnum_Pharmaceuticals__Injectable_Steroids
http://ebrschools.instructure.com/eportfolios/6115/Flunil_10_Mg_Capsule__Intas__Antidepressants

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In this case, it would be the magazine title, the volume number, the issue number, the page numbers, and the URL.