Indexing

Google Scholar

International Impact Factor Services

Directory of Research Journal Indexing 

Websquash

EZB-University Library of Regensburg

Open Academic Journals Index 

Directory of Indexing and Impact Factor (DIIF)

Citefactor

Pubicon Science Index

Scientific Indexing Services

Bibliothekssystem Universität Hamburg

Refseek

InfoBase Index 

SJIF – Scientific Journal Impact Factor

Universal Impact Factor

Social science Research Center Berlin 

hochschule hannover – university of applied sciences and arts  

Jour info  

Global Impact Factor (GIF) (Impact factor: 0.204)

Advanced Science Index 

Research Bible 

Technical University of Berlin 

Universität Leipzig 

Universität des Saarlandes

 ILSE – IPN Library Search Engine (1128)  

Freie Universität  

Science Impact Factor (Impact Factor: 0.69)  

Journal Impact Factor (JIF)

TU Clausthal

WorldCat 

wissenschaftskolleg zu berlin 

KVK – Karlsruher Virtueller Katalog

Thunderstone Website Catalog (1371)

Sjournals 

TIB (German National Library of Science and Technology)

International Institute of Organized Research