It is spelled 'acknowledgement' in British English and 'acknowledgment' in American English.
In a Chicago style footnote, list 2 authors. If there are more than 2, name only the first author, followed by “et al.” In the bibliography, list up to 6 authors. If there are more than 6, list the first 3 followed by “et al.”
Both acknowledgment and acknowledgement appear throughout the English-speaking world, but acknowledgment, without the middle e, is preferred in U.S. and Canadian English, while acknowledgement is preferred outside North America.
Acknowledgements dos and don'ts Write in first-person, professional language. Thank your professional contacts first. Include full names, titles, and roles of professional acknowledgements. Include personal or intangible supporters, like friends, family, or even pets. Mention funding bodies and what they funded.
While “acknowledgement” includes an extra “e” and aligns with British English, “acknowledgment” is the preferred spelling in American English.
The City of Chicago is located on land that is and has long been a center for Native peoples. The area is the traditional homelands of the Anishinaabe, or the Council of the Three Fires: the Ojibwe, Odawa, and Potawatomi Nations.
Both acknowledgement and acknowledgment are correct. The former is commonly used in regions using British English, while the latter is the spelling favored by countries using American English.
Format: Author Surname, Initials (Year) Letter information eg. sender and recipient, Day Month. Letter.
Author full name, Book Title: Subtitle, edition. (Place of publication: Publisher, Year), page numbers, URL. Author last name, Shortened Book Title, page number(s). When citing a chapter from a multi-authored book, start with details of the chapter, followed by details of the book.