National Revenue Authority (NRA), Sierra Leone

- ISBN: 978-613-8-93235-2

- ISBN: 978-613-8-82345-2

- ISBN: 978-613-8-83884-5

Success determinants of a regional network using the example of cooperation between tourism and agriculture

- ISBN: 978-613-8-95808-6

- ISBN: 978-620-8-84692-3

Orgaosilicon chemistry

- ISBN: 978-620-5-52063-5

- ISBN: 978-620-6-76881-4

- ISBN: 978-620-6-76874-6

- ISBN: 978-620-2-31128-1

Based on the Current Research

- ISBN: 978-620-2-30515-0