Meikel, G., Imhof, W. and Riedel, H.. "§ 25". Band 2, Lieferung 3 §§ 20–28 GBO, Berlin, Boston: De Gruyter, 1968, pp. 1707-1743. https://doi.org/10.1515/9783112322789-006
Meikel, G., Imhof, W. & Riedel, H. (1968). § 25. In Band 2, Lieferung 3 §§ 20–28 GBO (pp. 1707-1743). Berlin, Boston: De Gruyter. https://doi.org/10.1515/9783112322789-006
Meikel, G., Imhof, W. and Riedel, H. 1968. § 25. Band 2, Lieferung 3 §§ 20–28 GBO. Berlin, Boston: De Gruyter, pp. 1707-1743. https://doi.org/10.1515/9783112322789-006
Meikel, G., Imhof, W. and Riedel, H.. "§ 25" In Band 2, Lieferung 3 §§ 20–28 GBO, 1707-1743. Berlin, Boston: De Gruyter, 1968. https://doi.org/10.1515/9783112322789-006