Cita APA (7th ed.)

Hugo, W. B. (1972). An introduction to microbiology. William Heinemann medical books.

Cita Chicago (17th ed.)

Hugo, W. B. An Introduction to Microbiology. London: William Heinemann medical books, 1972.

Cita MLA (9th ed.)

Hugo, W. B. An Introduction to Microbiology. William Heinemann medical books, 1972.