World geographical encyclopedia 4: Europe
edited by Sybil P. Parker
McGraw-HIll, 1995
 Buku Referensi
World geographical encyclopedia 3: Asia
edited by Sybil P. Parker
McGraw-HIll, 1995
 Buku Referensi
World geographical encyclopedia 1: Africa
edited by Sybil P. Parker
McGraw-HIll, 1995
 Buku Referensi
World geographical encyclopedia 5: Oceania; index
edited by Sybil P. Parker
McGraw-HIll, 1995
 Buku Referensi
Geographical atlas of the world
Foreword by William R. Mead
Tiger Book International, 1995
 Buku Referensi