Valore

Pearson+

pearson.com

Perlego

perlego.com

Chegg

chegg.com

RedShelf

redshelf.com

VitalSource

vitalsource.com

Textbooks.com

textbooks.com

Varsity Tutors

varsitytutors.com

OpenStax

openstax.org

zyBooks

zybooks.com

Value Research

valueresearchonline.com

ProQuest

proquest.com

Libretexts

libretexts.org

Bookboon

bookboon.com

Clusterbooks

clusterbooks.com

Bartleby

bartleby.com

Runestone Academy

runestone.academy

Bokus

bokus.com

BrokeScholar

brokescholar.com

MyEducator

myeducator.com

RefSeek

refseek.com

Valutico

valutico.com

Valuer

valuer.ai

BiblioTech

bexarbibliotech.org

Quero Bolsa

querobolsa.com.br