American Psychological Association 6th edition

Helm masterclass : from beginner to advanced. [Electronic]. [ca. 2025]. [Place of publication not identified]: Packt Publishing.

ISO-690 (author-date, English)

Helm masterclass : from beginner to advanced., 2025. . [electronic]. 2025. [First edition]. [Place of publication not identified]: Packt Publishing. ISBN 9781837025374.

Modern Language Association 9th edition

Helm masterclass : from beginner to advanced. [First edition], electronic, Packt Publishing, 2025.

Mohr Siebeck - Recht (Deutsch - Österreich)

Emerald - Harvard

„Helm masterclass : from beginner to advanced.“. (2025), , Packt Publishing, [Place of publication not identified].

Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.