If you are using an edited book which does not have author names linked to the chapters, then you can credit the editor of the book in your citation and reference. If you are using more than one chapter from this same text, you will need to differentiate your citations by using a and b after the year to clarify which chapters you are referring to, for example (Cox and Roper, 2005a, p.13).
Format: in text citation
When dealing with patients with respiratory difficulties it is essential that health professionals are aware of the non-verbal signals the patient is using to communicate with them (Surname, Year, Page).
Format: reference
Editor surname, initials. (ed.) (Year) Title of chapter. In: Title of book. Edition. Place of publication: Publisher, pp.first and last page numbers.
Example: in text citation
When dealing with patients with respiratory difficulties it is essential that health professionals are aware of the non-verbal signals the patient is using to communicate with them (Cox and Roper, 2005, p.24).
Example: reference
Cox, N. and Roper, R. A. (eds.) (2005) Cardiovascular system. In: Clinical skills. Oxford: Oxford University Press, pp.21-73.