- Various. Harry Liedtke, comp. 239 Days in America: Compilation of Essays from 239days.com (2012/2023). Compilation of text and visuals from the website 239days.com, covering Abdu'l-Bahá's visit from April 11 - Dec 5, 1912.
- Harry Liedtke. `Abdu'l-Bahá's Tablet of the Universe (2023). Summary of the themes and meanings behind the Lawh-i-Aflakiyyih in light of contemporary science.
- Adelbert Muhlschlegel. Gisele Liedtke, trans. Adelbert Mühlschlegel: Seine Gedichte in zwei Sprachen: His Poetry in Two Languages (2010). Overview of the life of this Hand of the Cause, written by his daughter and son-in-law, and a selection of 31 poems, with the original German and English translation presented side-by-side.
- Harry Liedtke. Der Herr Ist Nahe / The Lord Is Near: The Divine Mystery of the Transformation of Mt. Carmel (2022). Brief history of the Templer Society and Georg David Hardegg, who landed in Haifa in 1868 and built a spiritual colony at the foot of Mt. Carmel.
- Harry Liedtke. German Baha'i Community under National Socialism, The: A Historical Perspective With Notes, Postscript, and Photographs (1999/2000). Examination of why Bahá’ís, as an international Community or as individuals, did not play an active role in preventing the rise of the Nazis; in truth, they acted heroically and did exactly what was asked of them by the Guardian.
- Harry Liedtke. Greenland Promise, The (2012). Commentary on the misunderstood prediction of Abdu'l-Bahá that Greenland would one day become green again.
- Harry Liedtke. Guardian's Wartime Travels, The (2016). Brief chronology of world events 1938-1940 juxtaposed with Shoghi Effendi's travels in 1940, when he left Haifa for England nine months after the beginning of the war.
- Harry Liedtke. Humanity and the Universe: Mirror of the Unknown (1996/2016). A study of the origin and nature of the universe in light of Bahá'í texts; creation and evolution; cosmology and life in the universe; technological progress; science and religion; the nature of time, our senses, and free will.
- Harry Liedtke. Jalal Khazeh Remembered (2023-04). Memory of meeting a Hand of the Cause of God at the first Bahá'í World Congress, April 28, 1963, and a brief tangent on the history of Royal Albert Hall, London.
- Udo Schaefer. Harry Liedtke, trans. Loyalty to the Covenant and Critical Thought (2001-01). A commentary for Bahá’ís examining the balance of critical thought with loyalty to Bahá’í institutions.
- Harry Liedtke. Thousand Years Must Elapse: Examining a Tablet by 'Abdu'l-Bahá (2022). Commentary on a tablet by 'Abdu'l-Baha that addresses the present debasement of Persia and its future glory, and the Western world.
- Harry Liedtke. Wayfarer between Two Worlds, A: Recollections (2013/2022). A chronicle of some of the highlights of the author's seventy-five years as a Bahá'í, and covering the years 1927-2022, including periods in Germany and Canada and historical events from each. Includes poems and photographs.
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