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Sivriev, Sava: Central and Eastern European Online Library (CEEOL), <http://www.ceeol.com/aspx/authordetails.aspx?authorid=cd257037-0da8-48f0-918b-acf871e9f19e>.

Sivriev, Sava: Agidale Beta <http://agidale.com/index.php?cmd=Search&q=Sava+Sivriev>

Sivriev, Sava. Mythos i technē : opit vŭrkhu bŭlgarskata literatura ot minalii︠a︡ vek. // Library of Congress Online Catalog. Washington, DC. <http://catalog.loc.gov/vwebv/search?searchArg=sivriev%2C+sava&searchCode=GKEY%5E*&searchType=0&recCount=25>.

Sivriev, Sava. Kniga Psaltir i bŭlgarskata poezii͡a / Sofii͡a: Izd-vo "Karina-Mariana Todorova", 2004. // Stanford University Libraries <http://searchworks.stanford.edu/view/6287123>.

Sivriev, Sava. Kniga Psaltir i bʺlgarskata poeziâ. // Bibliothèque nationale de France. <http://catalogue.bnf.fr/servlet/biblio?idNoeud=1&ID=40988108&SN1=0&SN2=0&host=catalogue>.

Sivriev, Sava. Kniga Psaltir i bŭlgarskata poezii︠a︡. // Library of Congress Online Catalog. Washington, DC. <http://catalog.loc.gov/vwebv/search?searchArg=sivriev%2C+sava&searchCode=GKEY%5E*&searchType=0&recCount=25>.

Drugata bŭlgarska literature, 2009: tekstove ot i︠u︡bileĭnata nauchna konferent︠s︡ii︠a︡, provedena v Shumen na 29 noemvri 2006 g. // OCLC Classify… <http://www.worldcat.org/title/drugata-bulgarska-literatura-tekstove-ot-iubileinata-nauchna-konferentsiia-provedena-v-shumen-na-29-noemvri-2006-g/oclc/647357714>

Predstavi za bŭlgarskii︠a︡ literaturen kanon, 2009:

Library of Congress Online Catalog. Washington, DC. <http://catalog.loc.gov/vwebv/search?searchArg=sivriev%2C+sava&searchCode=GKEY%5E*&searchType=0&recCount=25>.

National library of Australia <http://trove.nla.gov.au/work/152557305?versionId=166271338>

OCLC Classify… <http://classify.oclc.org/classify2/ClassifyDemo?swid=712778643>

Open Library <https://openlibrary.org/works/OL15994426W/Predstavi_za_b%C5%ADlgarskii%EF%B8%A0a%EF%B8%A1_literaturen_kanon>

University of Illinois at Urbana-Champaign <http://vufind.carli.illinois.edu/vf-uiu/Record/uiu_6599038>.