Fac Hotel Management & Tourism Vrnjacka Banja.

Society for Industrial and Applied Mathematics Publications.

Xia and He Publishing Inc..

Xia and He Publishing Inc..

John Wiley and Sons Ltd.

UDMURT STATE UNIV.

ST ELIZABETH UNIV HEALTH & SOCIAL WORK BRATISLAVA.

John Wiley and Sons Ltd.

John Wiley and Sons Ltd.

John Wiley and Sons Ltd.

WILEY.

Ltd "Integration: Education and Science".

Ltd "Integration: Education and Science".

Ltd "Integration: Education and Science".

SAGE Publications Ltd.