Cita APA (7th ed.)

Heller, S. R. (1990). The beilstein online database: Implementation, content, and retrieval. American Chemical Society.

Cita Chicago (17th ed.)

Heller, Stephen R. The Beilstein Online Database: Implementation, Content, and Retrieval. Washington, DC: American Chemical Society, 1990.

Cita MLA (9th ed.)

Heller, Stephen R. The Beilstein Online Database: Implementation, Content, and Retrieval. American Chemical Society, 1990.