A reference can be pointed.Logical formLearned from374 sentences. A reference may pertain-to a US-president.Logical formLearned from372 sentences. A reference can be biblical.Logical formLearned from372 sentences. A reference can be to an object.Logical formLearned from351 sentences. References can be in popular culture.Logical formLearned from348 sentences. References can be to a country.Logical formLearned from343 sentences. A letter can be constituted-of-or-filled-with reference.Logical formLearned from332 sentences. A reference may pertain-to persons.Logical formLearned from323 sentences. References can be veiled.Logical formLearned from321 sentences. A book can be a reference.Logical formLearned from315 sentences. A reference can be to a song.Logical formLearned from315 sentences. Reference can be to a person.Logical formLearned from312 sentences. References can be useful.Logical formLearned from310 sentences. References can be available upon request.Logical formLearned from310 sentences. References can be to objects.Logical formLearned from304 sentences.