theoretical perspectives

- ISBN: 978-613-8-93937-5

Along the Orange River Catchment for Base Metal, Prieska, Northern Cape, South Africa

- ISBN: 978-613-8-95383-8

- ISBN: 978-613-8-83353-6

- ISBN: 978-3-639-66094-4

- ISBN: 978-613-8-97183-2

Decision Making through Data

- ISBN: 978-3-639-71570-5

- ISBN: 978-620-2-31314-8

Descriptive analysis and performer's guide

- ISBN: 978-3-639-71469-2

- ISBN: 978-620-2-30155-8

- ISBN: 978-620-2-31418-3