Joerdens-Roettger, D. (1987). Seed potato production in the Philippines: In vitro culture and rapid multiplication techniques. TZ-Verlagsgesellschaft.
Tohutoru Kātū Chicago (17th ed.)Joerdens-Roettger, Dagmar. Seed Potato Production in the Philippines: In Vitro Culture and Rapid Multiplication Techniques. Eschborn: TZ-Verlagsgesellschaft, 1987.
Tohutoro MLA (9th ed.)Joerdens-Roettger, Dagmar. Seed Potato Production in the Philippines: In Vitro Culture and Rapid Multiplication Techniques. TZ-Verlagsgesellschaft, 1987.
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