Cita APA (7th ed.)

Alemayehu, A., & Brown, D. R. (1993). Gastrointestinal regulatory peptides. Springer-Verlag.

Cita Chicago (17th ed.)

Alemayehu, A., i David Robert Brown. Gastrointestinal Regulatory Peptides. Berlin: Springer-Verlag, 1993.

Cita MLA (9th ed.)

Alemayehu, A., i David Robert Brown. Gastrointestinal Regulatory Peptides. Springer-Verlag, 1993.