קפלן, מרדכי מנחם (1881-1983)

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Mordecai Menahem Kaplan, "Judaism in Transition" (1936).

ברגמן, שמואל הוגו, 1883-1975

אונדזער רעכט צו האבן ספקות : וועגן דעם חרם פון אגודת הרבנים אויף רבי מרדכי קאפלאן : מיט אן אריינפיר / ש. ניגער.

ניגער, שמואל, 1883-1955

Correspondence with Mordechai Kaplan on the Society of the Jewish Renascence and printed material on the Society.

Correspondence with Mordechai Kaplan on the Society of the Jewish Renascence and printed material on the Society.

Printed material of the Society for the Advancement of Judaism (headed by Mordechai Kaplan).

The new Haggadah for the Pesah seder / edited by Mordecai M. Kaplan, Eugene Kohn, and Ira Eisenstein, for the Jewish Reconstructionist Foundation.

Correspondence with Alice Seligsberg on Mordechai Kaplan's relations with the Jewish Theological Seminary.

The new Haggadah for the Pesah seder / edited by Mordecai M. Kaplan, Eugene Kohn, and Ira Eisenstein for the Jewish Reconstructionist Foundation ; illustrated by Leonard Weisgard.