Source: AMA manual of style
A secondary source/indirect citation is when the ideas of one author are published in another author’s text but you have not read or accessed the original author’s work.
In-text citation:
Higgins1 discusses Newman’s research in his work ...
Clements2 quoted Chandler in his article ...
Reference list:
Editor(s) - Family name and initials, editors. Title of book. Edition (if not first) - ed. Place of publication: Publisher name; Year of publication.
Citing medicine: the NLM style guide for authors, editors, and publishers (2nd edition) and AMA manual of style provide detailed guidance in formatting bibliographic citations in Vancouver referencing style.