Here are some books that you may find useful during your studies. Search the Bennies catalogue Oliver for more, or browse the Non-fiction collection NFS.
Pregnancy food by 
Cancer prevention : cooking for health by 
http://www.flickr.com/photos/55839512@N08/9018429130
http://www.flickr.com/photos/55839512@N08/8550034051
http://www.flickr.com/photos/41284017@N08/14590005039
Always consider how you search. If you use inverted commas (eg. "Ancient Egypt") you will perform a more accurate search.
Also, consider limiting the results to educational insitutions by adding site:.edu to your search terms
Referencing using the Harvard Author-Date System
