APA

Kühnen T., Knappke F., Otto T., Friedrich S., Klein J. P., Kahl K. G., Hüppe M., Sipos V. & Schweiger U. (20120406). Chronic depression: development and evaluation of the luebeck questionnaire for recording preoperational thinking (LQPT). : BMC psychiatry.

Chicago

Kühnen Tanja, Knappke Franziska, Otto Tanja, Friedrich Stephanie, Klein Jan P, Kahl Kai G, Hüppe Michael, Sipos Valerija and Schweiger Ulrich. 20120406. Chronic depression: development and evaluation of the luebeck questionnaire for recording preoperational thinking (LQPT). : BMC psychiatry.

Harvard

Kühnen T., Knappke F., Otto T., Friedrich S., Klein J. P., Kahl K. G., Hüppe M., Sipos V. and Schweiger U. (20120406). Chronic depression: development and evaluation of the luebeck questionnaire for recording preoperational thinking (LQPT). : BMC psychiatry.

MLA

Kühnen Tanja, Knappke Franziska, Otto Tanja, Friedrich Stephanie, Klein Jan P, Kahl Kai G, Hüppe Michael, Sipos Valerija and Schweiger Ulrich. Chronic depression: development and evaluation of the luebeck questionnaire for recording preoperational thinking (LQPT). : BMC psychiatry. 20120406.