Published in Gulf Research Reports, in 1968, in volume 2, issue 3, pages 213-254

Published in Gulf Research Reports, in 1968, in volume 2, issue 3, pages 257-271

Published in Gulf Research Reports, in 1968, in volume 2, issue 3, pages 273-279

Published in Gulf Research Reports, in 1968, in volume 2, issue 3, pages 285-299

Published in Gulf Research Reports, in 1968, in volume 2, issue 3, pages 301-312

Published in Gulf Research Reports, in 1968, in volume 2, issue 3, pages 313-321

Published in Gulf Research Reports, in 1968, in volume 2, issue 3, pages 325-329