Final answer:
Peer-reviewed scientific journals are an example of a good/reputable source of secondary literature.
Step-by-step explanation:
A. Peer-reviewed scientific journals
B. Personal blogs
C. Social media posts
D. Wikipedia
Among the given options, peer-reviewed scientific journals are the best example of a good/reputable source of secondary literature. These journals undergo a rigorous peer-review process, where experts in the field evaluate the research before it is published. This ensures that the information is accurate, reliable, and meets high academic standards.