A reference can be simple.Logical formLearned from142 sentences. References can be textual.Logical formLearned from142 sentences. References can be topical.Logical formLearned from142 sentences. A reference can be practical.Logical formLearned from141 sentences. A person may have some references.Logical formLearned from141 sentences. Work can be constituted-of-or-filled-with reference.Logical formLearned from140 sentences. A reference can be to a name.Logical formLearned from140 sentences. Reference can be to work.Logical formLearned from140 sentences. A reference can be ironic.Logical formLearned from140 sentences. References can be to resources.Logical formLearned from140 sentences. References can be reliable.Logical formLearned from140 sentences. References may be cited.Logical formLearned from139 sentences. A reference can be tongue-in-cheek.Logical formLearned from136 sentences. References may be listed.Logical formLearned from129 sentences. References can be to work.Logical formLearned from129 sentences.