Koukopoulos, A (jaanuar 2003). "Ewald Hecker's description of cyclothymia as a cyclical mood disorder: its relevance to the modern concept of bipolar II". Journal of Affective Disorders. 73 (1–2): 199–205. DOI:10.1016/S0165-0327(02)00326-9. PMID12507752.
Perugi, G; Hantouche, E; Vannucchi, G; Pinto, O (01.09.2015). "Cyclothymia reloaded: A reappraisal of the most misconceived affective disorder". Journal of Affective Disorders. 183: 119–33. DOI:10.1016/j.jad.2015.05.004. PMID26005206.
Koukopoulos, A (jaanuar 2003). "Ewald Hecker's description of cyclothymia as a cyclical mood disorder: its relevance to the modern concept of bipolar II". Journal of Affective Disorders. 73 (1–2): 199–205. DOI:10.1016/S0165-0327(02)00326-9. PMID12507752.
Commentary on Hecker and his work: Baethge, C; Salvatore, P; Baldessarini, RJ (september 2003). "Cyclothymia, a circular mood disorder". History of Psychiatry. 14 (55 Pt 3): 377–390. DOI:10.1177/0957154X030143008. PMID14621693. New translation of Hecker's 1898 paper: Hecker, Ewald; Salvatore, P; Baldessarini, R. J. (september 2003). "Classic Text No 55: Cyclothymia, a Circular Mood Disorder by Hecker, 1898". History of Psychiatry. 14 (55 Pt 3): 391–399. DOI:10.1177/0957154X030143008. PMID14621693.
Parker, G; McCraw, S; Fletcher, K (juuni 2012). "Cyclothymia". Depression and Anxiety. 29 (6): 487–94. DOI:10.1002/da.21950. PMID22553122.
Koukopoulos, A (jaanuar 2003). "Ewald Hecker's description of cyclothymia as a cyclical mood disorder: its relevance to the modern concept of bipolar II". Journal of Affective Disorders. 73 (1–2): 199–205. DOI:10.1016/S0165-0327(02)00326-9. PMID12507752.
Perugi, G; Hantouche, E; Vannucchi, G; Pinto, O (01.09.2015). "Cyclothymia reloaded: A reappraisal of the most misconceived affective disorder". Journal of Affective Disorders. 183: 119–33. DOI:10.1016/j.jad.2015.05.004. PMID26005206.
Koukopoulos, A (jaanuar 2003). "Ewald Hecker's description of cyclothymia as a cyclical mood disorder: its relevance to the modern concept of bipolar II". Journal of Affective Disorders. 73 (1–2): 199–205. DOI:10.1016/S0165-0327(02)00326-9. PMID12507752.
Commentary on Hecker and his work: Baethge, C; Salvatore, P; Baldessarini, RJ (september 2003). "Cyclothymia, a circular mood disorder". History of Psychiatry. 14 (55 Pt 3): 377–390. DOI:10.1177/0957154X030143008. PMID14621693. New translation of Hecker's 1898 paper: Hecker, Ewald; Salvatore, P; Baldessarini, R. J. (september 2003). "Classic Text No 55: Cyclothymia, a Circular Mood Disorder by Hecker, 1898". History of Psychiatry. 14 (55 Pt 3): 391–399. DOI:10.1177/0957154X030143008. PMID14621693.
Parker, G; McCraw, S; Fletcher, K (juuni 2012). "Cyclothymia". Depression and Anxiety. 29 (6): 487–94. DOI:10.1002/da.21950. PMID22553122.