0.3.0 (latest) 0.2.1 0.1.0 Reference documentation and code samples for the Developer Knowledge V1 API class Google::Developers::DeveloperKnowledge::V1::Answer::CitationSource.

Citation source.

## Inherits

- Object

## Extended By

- Google::Protobuf::MessageExts::ClassMethods

## Includes

- Google::Protobuf::MessageExts

## Methods

### #reference_index

    def reference_index() -> ::Integer

**Returns**

- (::Integer) --- Output only. Contains the index of the [Answer.AnswerReference](https://developers.google.com/ruby/docs/reference/google-developers-developer_knowledge-v1/latest/Google-Developers-DeveloperKnowledge-V1-Answer-AnswerReference "Google::Developers::DeveloperKnowledge::V1::Answer::AnswerReference (class)") in the `references` repeated field.