Seibu Group

Architects of affluence: the Tsutsumi family and the Seibu-Saison Enterprises in twentieth-century Japan

Thomas R.H. Havens.

Tsutsumi Yoshiaki no 21-seiki senryaku

Shigeki Manabe

"Wakaki teio" Tsutsumi Yoshiaki ga yuku (Kou business)

Yasuo Hariki

Sezon bunka wa nani o yumemita

Nagae Akira

Tsutsumi Yoshiaki no shain kyōiku: Seibu gundan baitaritī no himitsu

Koike Ryōichi.

"Wakaki teiō" Tsutsumi Yoshiaki ga yuku

Hariki Yasuo.

Netsujo no kenjitsu keiei Tsutsumi Yoshiaki (Keiei no shinzui)

Yasuo Hariki

Tsutsumi Yoshiaki no senryaku goroku: Cho senkenryoku no nyu rida

Takeuchi, Rei

Tsutsumi Yoshiaki hisokanaru ketsudan: "Seibu shinwa" no nazo o toku

Kaminogō Toshiaki.

Seibu sezon gurupu: Tsutsumi Seiji no mirai senryaku o saguru

Kunio Aso