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one experience: Stolzlechner L, Bonorand A, Riemer S. (2022). Optimising Puppy Socialisation - Short- and Long-Term Effects of a Training Programme during the Early Socialisation Period. Animals. https://doi.org/10.3390/ani12223067

supple and malleable: Battaglia CL. (2009). Periods of Early Development and the Effects of Stimulation and Social Experiences in the Canine. Journal of Veterinary Behavior. https://doi.org/10.1016/j.jveb.2009.03.003

more rigid ratio: Howell T, King T, Bennett P. (2015). Puppy parties and beyond: the role of early age socialization practices on adult dog behavior. Veterinary Medicine: Research and Reports. doi: 10.2147/VMRR.S62081

three weeks of age: Stolzlechner L, Bonorand A, Riemer S. (2022). Optimising Puppy Socialisation - Short- and Long-Term Effects of a Training Programme during the Early Socialisation Period. Animals. https://doi.org/10.3390/ani12223067

teeth emerge: Donovan L. (2021). A Timeline of Puppy Teething. Puppy Health. https://www.akc.org/expert-advice/health/timeline-of-puppy-teething/

no fear: Serpell J, Duffy DL, Jagoe JA. The Domestic Dog: Its Evolution, Behavior And Interactions With People. 4th ed., Cambridge University Press, 2015. 98-99.
See also: American Veterinary Medical Association. (2015). Literature Review on the Welfare Implications of Socialization of Puppies & Kittens. 

quick startle and recovery:  Zheng A, Schmid S. (2023). A review of the neural basis underlying the acoustic startle response with a focus on recent developments in mammals. Neuroscience & Biobehavioral Reviews. https://www.sciencedirect.com/science/article/pii/S0149763423000982

research reveals: Stolzlechner L, Bonorand A, Riemer S. (2022). Optimising Puppy Socialisation - Short- and Long-Term Effects of a Training Programme during the Early Socialisation Period. Animals. https://doi.org/10.3390/ani12223067
See also Vaterlaws-Whiteside H, Hartmann A. (2017). Improving puppy behavior using a new standardized socialization program. Applied Animal Behavior Science. https://doi.org/10.1016/j.applanim.2017.08.003

enriched environment: Dehasse J. (1994). Sensory, Emotional and Social Development of the Young Dog. The Bulletin for Veterinary Clinical Ethology. http://www.joeldehasse.com/articles/a-english/puppy.html

habituation: Rankin C et al. (2009). Habituation Revisited: An Updated and Revised Description of the Behavioral Characteristics of Habituation. Neurobiol Learn Mem. doi: 10.1016/j.nlm.2008.09.012

research indicates: Martin K, Horwitz D, Landsberg G. Fears and Phobias in Dogs - Animals and People. https://vcahospitals.com/know-your-pet/fears-and-phobias-in-dogs---animals-and-people
See also: Serpell J, Duffy DL, Jagoe JA. (2016). Becoming a dog: Early experience and the development of behavior. The Domestic Dog: Its Evolution, Behavior and Interactions with People. DOI: https://doi.org/10.1017/9781139161800.006.
See also: Chaloupková H, Svobodová I, Vápeník P, Bartoš L. (2018). Increased resistance to sudden noise by audio stimulation during early ontogeny in German shepherd puppies. PLoS One. doi: 1 0.1371/journal.pone.0196553. PMID: 29723300; PMCID: PMC5933723.