Book with single author [from Print source using Vancouver]
Don't panic if you see several dates inside the book. The date you need to use is the one which matches the edition of the book that you're using. Ignore any dates that are just listed as reprints or impressions. Look on the book cover and see if it says e.g. Fourth edition (it should also say this on the title page inside the book). In this case all that you need to show in your reference in the bibliography/reference list is the date for the 4th edition of the book (and also give the edition after the book title). Search for the book on the library catalogue to check the details needed for the reference if you are unsure.
Author Initials. Title of book. Nth ed.[unless 1st in which case omit statement]. Place of publication: Publisher; year.
Cairns D. Essentials of pharmaceutical chemistry. 3rd ed. London: Pharmaceutical Press; 2008.
Lis-Balchin M. Aromatherapy science: a guide for healthcare professionals. London: Pharmaceutical Press; 2006.
Citation in Text
Remember this will be a running number at the first use of a reference. If the reference is re-used then repeat the number allocated. Keep your style constant, either parenthesis (number) throughout, or superscript number. Do not change between the two. If your department recommends a particular style then use that.
Lis-Balchin suggests the lack of clinical studies (1 p93) is due to .......
Lis-Balchin suggests the lack of clinical studies 1 (p93) is due to .....