Cengage Learning
Cengage Learning: Adjectives and Adverbs Comparative and Superlative Forms
This is an English style guide article focusing on comparative and superlative forms of adjectives and adverbs. It explains how to form these adjectives and adverbs, how to use them, and provides examples.
English Club
English Club: Irregular Adjectives
This is a reference page about irregular adjectives when forming the comparative and superlative forms (such as good, better, best); it offers an explanation and examples.