If you have no *.bib file, you can use a references field in the document’s YAML metadata. This should include an array of YAML-encoded references, for example:
--- title: "Writing an academic paper in R" author: "Author" date: "Date" output: pdf_document: number_sections: yes toc: yes references: - id: Meyer2000 title: A Constraint-Based Framework for Diagrammatic Reasoning author: - family: Meyer given: Bernd volume: 14 issue: 4 publisher: Applied Artificial Intelligence page: 327-344 type: article-journal issued: year: 2000 --- # Introduction `@Meyer2000` results in @Meyer2000. `@Meyer2000 [p. 328]` results in @Meyer2000 [p. 328] `[@Meyer2000]` results in [@Meyer2000] `[-@Meyer2000]` results in [-@Meyer2000] # Summary # References
Rendering this file results in the same output as in example "Specifying a bibliography".