أشهر مواقع مفيدة تستحق الزيارة – مواقع للعمل عن بعد

Up work.
Toptal .
Freelancer .
99designs .
People per hour.
Freelance Writing Gigs.
Fiverr
College Recruiter.
Kolabtree .
Envato Studio.
Guru .
DesignCrowd .
Nexxt .
Task Rabbit.
Writer Access.
Hireable .
Engineer Babu.
Design Contest.
Design hill.
Sky word.
مواقع للبحث العلمي
Google scholar.
Springer .
Research gate.
Academic microsoft.
Science direct.
Science research.
base search.
Ncbi .
scielo .