A selection of readings assembled for Noba by Julie Reese. Available online at https://nobaproject.com/textbooks/new-textbook-6af59ac0-4729-47d4-af57-f2e591379bb6.
An extensive virtual textbook with grouped links to concepts in organic chemistry. Available online at https://www2.chemistry.msu.edu/faculty/reusch/virttxtjml/intro1.htm.