Keiko Wakabayashi, Nihon no Jinko-Mondai to Shakaiteki-Genjitsu Dai-1-kan Riron hen / Keiko Wakabayashi, Nihon no Jinko-Mondai to Shakaiteki-Genjitsu Dai-2-kan Monograph hen, [Population Problems and Social Reality in Japan Volume I : Theories / Population Problems and Social Reality in Japan Volume II : Monographs]