To work out a price for use of the images you need more information, for example….
Print Run.
Circulation – Ireland, UK etc.
Size of the images.
Tones – colour or b+w.
Rights Status – is the client to recieve exclusive rights to the images.
Placement Area – cover or inside.
Right to credit.
Licensing Period.
To give you an idea, register with http://www.alamy.com, do a search for a similar image, then fill in the usage details to get a
good starting point of how much to charge. Hope that helps.