IEEE is a numbering style. A numbered list of references is placed at the end of the text.
Always confirm the required style with your lecturer.
The Chicago Author-Date referencing style has two basic systems of documentation:
A numeric citation system, commonly used in medical and scientific journals.
Referencing in Vancouver Citation Style requires:
The definitive guide to Vancouver referencing was developed by the National Library of Medicine in the US. The others are examples from other university libraries. Each are slightly different so it is important to be consistent with whichever version you follow.
The Vancouver system takes its name from a meeting in Vancouver, Canada in 1978 that led to the establishment of the International Committee of Medical Journal Editors. (ICMJE) This was further developed by the National Library of Medicine in the U.S whose version "should be considered as the authoritative style" according to the British Medical Association. (BMA)