All 3 A D De Groot releases on Hardcover Book
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![Cover for A D de Groot · Rede als richtsnoer (Hardcover Book) [Reprint 2023 edition] (1979)](https://imusic.b-cdn.net/images/item/original/975/9783112695975.jpg?a-d-de-groot-1979-rede-als-richtsnoer-hardcover-book&class=scaled&v=1763169960)
![Cover for A D de Groot · Studietoetsen. Construeren, afnemen, analyseren, deel 1 (Hardcover Book) [Reprint 2018 edition] (1969)](https://imusic.b-cdn.net/images/item/original/093/9783111189093.jpg?a-d-de-groot-1969-studietoetsen-construeren-afnemen-analyseren-deel-1-hardcover-book&class=scaled&v=1745705931)
![Cover for A D De Groot · Methodologie: Grondslagen Van Onderzoek En Denken in de Gedragswetenschappen (Hardcover Book) [Reprint 2020 edition] (1961)](https://imusic.b-cdn.net/images/item/original/766/9783112309766.jpg?a-d-de-groot-1961-methodologie-grondslagen-van-onderzoek-en-denken-in-de-gedragswetenschappen-hardcover-book&class=scaled&v=1657782826)