Cita APA (7th ed.)

Barber, H. G., & Haworth, E. Y. (1981). A guide to the morphology of the diatom frustule: With a key to the British freshwater genera. Freshwater Biological Association.

Cita Chicago (17th ed.)

Barber, Horace G., i Elizabeth Y. Haworth. A Guide to the Morphology of the Diatom Frustule: With a Key to the British Freshwater Genera. Cambria: Freshwater Biological Association, 1981.

Cita MLA (9th ed.)

Barber, Horace G., i Elizabeth Y. Haworth. A Guide to the Morphology of the Diatom Frustule: With a Key to the British Freshwater Genera. Freshwater Biological Association, 1981.