| Lemon zest source |
| Comfort-food source |
| Acid in proteins, informally |
| A primary source for Scandinavian mythology |
| Adams apple source |
| Composite Index source |
| Wheat protein |
| Avian sources of red meat |
| A source of aluminum |
| Andean wool sources |
| Agent's information source |
| Resource for working parents |
| Mobile source of criticism |
| A source of mother-of-pearl |
| Disreputable source |
| U.S.'s most abundant energy source |
| Subterranean sugar source |
| Accumulated resources. |
| Adjustable light source |
| Source of the meteors in a meteor shower |
| A source of mistakes |
| Breakfast fiber source |
| A Mississippi source |
| Reliable source of income |
| Liquid resources |
| Cider source |
| Abundant source of energy |
| Mythical source of fire |
| Andean source of fleece |
| Abbreviation for a quote whose source is unknown |