In Search of Sugihara:
The Elusive Japanese Diplomat Who Risked His Life to Rescue 10,000 Jews from the Holocaust
Hillel Levine

The Fugu Plan:
The Untold Story of the Japanese and the Jews During World War Two
Marvin Tokayer and Mary Swartz

Passage to Freedom:
The Sugihara Story
Ken Mochizuki, Dom Lee (Illustrator)

Japanese Diplomats and Jewish Refugees During World War II
Pamela Rotner Sakamoto

Visas for life
Yukiko Sugihara
(note: I think this book is out of print, but amazon.com can make a search for you)