APA (7th ed.) Citation

(1990). Naturally occurring pyrrolizidine alkaloids. CRC Press.

Chicago Style (17th ed.) Citation

Naturally Occurring Pyrrolizidine Alkaloids. Boca Raton u.a: CRC Press, 1990.

MLA (9th ed.) Citation

Naturally Occurring Pyrrolizidine Alkaloids. CRC Press, 1990.

Warning: These citations may not always be 100% accurate.