APA (7th ed.) Citation

The new encyclopaedia Britannica: [in 32 vol.] (15. ed., [20. print.].). Encyclopaedia Britannica.

Chicago Style (17th ed.) Citation

The New Encyclopaedia Britannica: [in 32 Vol.]. 15. ed., [20. print.]. Chicago u.a: Encyclopaedia Britannica.

MLA (9th ed.) Citation

The New Encyclopaedia Britannica: [in 32 Vol.]. 15. ed., [20. print.]. Encyclopaedia Britannica.